Finite Math Examples

$a + b + c = 240$ , $\frac{a}{4} + \frac{b}{2} + \frac{c}{5} = 60$ , $2 b + 5 c - 810 = 0$

Step 1

Move all terms not containing $a$ to the right side of the equation.

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Step 1.1

Subtract $b$ from both sides of the equation.

$a + c = 240 - b$

$\frac{a}{4} + \frac{b}{2} + \frac{c}{5} = 60$

$2 b + 5 c - 810 = 0$

Step 1.2

Subtract $c$ from both sides of the equation.

$a = 240 - b - c$

$\frac{a}{4} + \frac{b}{2} + \frac{c}{5} = 60$

$2 b + 5 c - 810 = 0$

$a = 240 - b - c$

$\frac{a}{4} + \frac{b}{2} + \frac{c}{5} = 60$

$2 b + 5 c - 810 = 0$

Step 2

Replace all occurrences of $a$ with $240 - b - c$ in each equation.

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Step 2.1

Replace all occurrences of $a$ in $\frac{a}{4} + \frac{b}{2} + \frac{c}{5} = 60$ with $240 - b - c$ .

$\frac{240 - b - c}{4} + \frac{b}{2} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $\frac{240 - b - c}{4} + \frac{b}{2} + \frac{c}{5}$ .

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Step 2.2.1.1

To write $\frac{b}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{240 - b - c}{4} + \frac{b}{2} \cdot \frac{2}{2} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.2

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.2.1.2.1

Multiply $\frac{b}{2}$ by $\frac{2}{2}$ .

$\frac{240 - b - c}{4} + \frac{b \cdot 2}{2 \cdot 2} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.2.2

Multiply $2$ by $2$ .

$\frac{240 - b - c}{4} + \frac{b \cdot 2}{4} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{240 - b - c}{4} + \frac{b \cdot 2}{4} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.3

Combine the numerators over the common denominator.

$\frac{240 - b - c + b \cdot 2}{4} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.4

Add $- b$ and $b \cdot 2$ .

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Step 2.2.1.4.1

Reorder $b$ and $2$ .

$\frac{240 - b + 2 \cdot b - c}{4} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.4.2

Add $- b$ and $2 \cdot b$ .

$\frac{240 + b - c}{4} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{240 + b - c}{4} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.5

To write $\frac{240 + b - c}{4}$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$\frac{240 + b - c}{4} \cdot \frac{5}{5} + \frac{c}{5} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.6

To write $\frac{c}{5}$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\frac{240 + b - c}{4} \cdot \frac{5}{5} + \frac{c}{5} \cdot \frac{4}{4} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.7

Write each expression with a common denominator of $20$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.2.1.7.1

Multiply $\frac{240 + b - c}{4}$ by $\frac{5}{5}$ .

$\frac{(240 + b - c) \cdot 5}{4 \cdot 5} + \frac{c}{5} \cdot \frac{4}{4} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.7.2

Multiply $4$ by $5$ .

$\frac{(240 + b - c) \cdot 5}{20} + \frac{c}{5} \cdot \frac{4}{4} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.7.3

Multiply $\frac{c}{5}$ by $\frac{4}{4}$ .

$\frac{(240 + b - c) \cdot 5}{20} + \frac{c \cdot 4}{5 \cdot 4} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.7.4

Multiply $5$ by $4$ .

$\frac{(240 + b - c) \cdot 5}{20} + \frac{c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{(240 + b - c) \cdot 5}{20} + \frac{c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.8

Combine the numerators over the common denominator.

$\frac{(240 + b - c) \cdot 5 + c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.9

Simplify the numerator.

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Step 2.2.1.9.1

Apply the distributive property.

$\frac{240 \cdot 5 + b \cdot 5 - c \cdot 5 + c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.9.2

Simplify.

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Step 2.2.1.9.2.1

Multiply $240$ by $5$ .

$\frac{1200 + b \cdot 5 - c \cdot 5 + c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.9.2.2

Move $5$ to the left of $b$ .

$\frac{1200 + 5 \cdot b - c \cdot 5 + c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.9.2.3

Multiply $5$ by $- 1$ .

$\frac{1200 + 5 \cdot b - 5 c + c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{1200 + 5 \cdot b - 5 c + c \cdot 4}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.9.3

Move $4$ to the left of $c$ .

$\frac{1200 + 5 b - 5 c + 4 \cdot c}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 2.2.1.9.4

Add $- 5 c$ and $4 c$ .

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$2 b + 5 c - 810 = 0$

Step 3

Solve for $b$ in $2 b + 5 c - 810 = 0$ .

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Step 3.1

Move all terms not containing $b$ to the right side of the equation.

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Step 3.1.1

Subtract $5 c$ from both sides of the equation.

$2 b - 810 = - 5 c$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 3.1.2

Add $810$ to both sides of the equation.

$2 b = - 5 c + 810$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$2 b = - 5 c + 810$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 3.2

Divide each term in $2 b = - 5 c + 810$ by $2$ and simplify.

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Step 3.2.1

Divide each term in $2 b = - 5 c + 810$ by $2$ .

$\frac{2 b}{2} = \frac{- 5 c}{2} + \frac{810}{2}$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $2$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{2 b}{2} = \frac{- 5 c}{2} + \frac{810}{2}$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 3.2.2.1.2

Divide $b$ by $1$ .

$b = \frac{- 5 c}{2} + \frac{810}{2}$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$b = \frac{- 5 c}{2} + \frac{810}{2}$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$b = \frac{- 5 c}{2} + \frac{810}{2}$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Move the negative in front of the fraction.

$b = - \frac{5 c}{2} + \frac{810}{2}$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 3.2.3.1.2

Divide $810$ by $2$ .

$b = - \frac{5 c}{2} + 405$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$b = - \frac{5 c}{2} + 405$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$b = - \frac{5 c}{2} + 405$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$b = - \frac{5 c}{2} + 405$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

$b = - \frac{5 c}{2} + 405$

$\frac{1200 + 5 b - c}{20} = 60$

$a = 240 - b - c$

Step 4

Replace all occurrences of $b$ with $- \frac{5 c}{2} + 405$ in each equation.

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Step 4.1

Replace all occurrences of $b$ in $\frac{1200 + 5 b - c}{20} = 60$ with $- \frac{5 c}{2} + 405$ .

$\frac{1200 + 5 (- \frac{5 c}{2} + 405) - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify $\frac{1200 + 5 (- \frac{5 c}{2} + 405) - c}{20}$ .

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Step 4.2.1.1

Simplify the numerator.

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Step 4.2.1.1.1

Apply the distributive property.

$\frac{1200 + 5 (- \frac{5 c}{2}) + 5 \cdot 405 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.2

Multiply $5 (- \frac{5 c}{2})$ .

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Step 4.2.1.1.2.1

Multiply $- 1$ by $5$ .

$\frac{1200 - 5 \frac{5 c}{2} + 5 \cdot 405 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.2.2

Combine $- 5$ and $\frac{5 c}{2}$ .

$\frac{1200 + \frac{- 5 (5 c)}{2} + 5 \cdot 405 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.2.3

Multiply $5$ by $- 5$ .

$\frac{1200 + \frac{- 25 c}{2} + 5 \cdot 405 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$\frac{1200 + \frac{- 25 c}{2} + 5 \cdot 405 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.3

Multiply $5$ by $405$ .

$\frac{1200 + \frac{- 25 c}{2} + 2025 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.4

Move the negative in front of the fraction.

$\frac{1200 - \frac{25 c}{2} + 2025 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.5

Add $1200$ and $2025$ .

$\frac{- \frac{25 c}{2} + 3225 - c}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.6

To write $- c$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{- \frac{25 c}{2} - c \cdot \frac{2}{2} + 3225}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.7

Combine $- c$ and $\frac{2}{2}$ .

$\frac{- \frac{25 c}{2} + \frac{- c \cdot 2}{2} + 3225}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.8

Combine the numerators over the common denominator.

$\frac{\frac{- 25 c - c \cdot 2}{2} + 3225}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.9

To write $3225$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{\frac{- 25 c - c \cdot 2}{2} + 3225 \cdot \frac{2}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.10

Combine $3225$ and $\frac{2}{2}$ .

$\frac{\frac{- 25 c - c \cdot 2}{2} + \frac{3225 \cdot 2}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.11

Combine the numerators over the common denominator.

$\frac{\frac{- 25 c - c \cdot 2 + 3225 \cdot 2}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.12

Rewrite $\frac{- 25 c - c \cdot 2 + 3225 \cdot 2}{2}$ in a factored form.

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Step 4.2.1.1.12.1

Multiply $2$ by $- 1$ .

$\frac{\frac{- 25 c - 2 c + 3225 \cdot 2}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.12.2

Multiply $3225$ by $2$ .

$\frac{\frac{- 25 c - 2 c + 6450}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.12.3

Subtract $2 c$ from $- 25 c$ .

$\frac{\frac{- 27 c + 6450}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.12.4

Factor $3$ out of $- 27 c + 6450$ .

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Step 4.2.1.1.12.4.1

Factor $3$ out of $- 27 c$ .

$\frac{\frac{3 (- 9 c) + 6450}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.12.4.2

Factor $3$ out of $6450$ .

$\frac{\frac{3 (- 9 c) + 3 (2150)}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.1.12.4.3

Factor $3$ out of $3 (- 9 c) + 3 (2150)$ .

$\frac{\frac{3 (- 9 c + 2150)}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$\frac{\frac{3 (- 9 c + 2150)}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$\frac{\frac{3 (- 9 c + 2150)}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$\frac{\frac{3 (- 9 c + 2150)}{2}}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.2

Multiply the numerator by the reciprocal of the denominator.

$\frac{3 (- 9 c + 2150)}{2} \cdot \frac{1}{20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.3

Multiply $\frac{3 (- 9 c + 2150)}{2} \cdot \frac{1}{20}$ .

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Step 4.2.1.3.1

Multiply $\frac{3 (- 9 c + 2150)}{2}$ by $\frac{1}{20}$ .

$\frac{3 (- 9 c + 2150)}{2 \cdot 20} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.3.2

Multiply $2$ by $20$ .

$\frac{3 (- 9 c + 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$\frac{3 (- 9 c + 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.4

Factor $- 1$ out of $- 9 c$ .

$\frac{3 (- (9 c) + 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.5

Rewrite $2150$ as $- 1 (- 2150)$ .

$\frac{3 (- (9 c) - 1 \cdot - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.6

Factor $- 1$ out of $- (9 c) - 1 (- 2150)$ .

$\frac{3 (- (9 c - 2150))}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.7

Simplify the expression.

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Step 4.2.1.7.1

Rewrite $- (9 c - 2150)$ as $- 1 (9 c - 2150)$ .

$\frac{3 (- 1 (9 c - 2150))}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.2.1.7.2

Move the negative in front of the fraction.

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 - b - c$

Step 4.3

Replace all occurrences of $b$ in $a = 240 - b - c$ with $- \frac{5 c}{2} + 405$ .

$a = 240 - (- \frac{5 c}{2} + 405) - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $240 - (- \frac{5 c}{2} + 405) - c$ .

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Step 4.4.1.1

Simplify each term.

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Step 4.4.1.1.1

Apply the distributive property.

$a = 240 + \frac{5 c}{2} - 1 \cdot 405 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.1.2

Multiply $- - \frac{5 c}{2}$ .

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Step 4.4.1.1.2.1

Multiply $- 1$ by $- 1$ .

$a = 240 + 1 (\frac{5 c}{2}) - 1 \cdot 405 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.1.2.2

Multiply $\frac{5 c}{2}$ by $1$ .

$a = 240 + \frac{5 c}{2} - 1 \cdot 405 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 + \frac{5 c}{2} - 1 \cdot 405 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.1.3

Multiply $- 1$ by $405$ .

$a = 240 + \frac{5 c}{2} - 405 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = 240 + \frac{5 c}{2} - 405 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.2

Subtract $405$ from $240$ .

$a = \frac{5 c}{2} - 165 - c$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.3

To write $- c$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$a = \frac{5 c}{2} - c \cdot \frac{2}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.4

Simplify terms.

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Step 4.4.1.4.1

Combine $- c$ and $\frac{2}{2}$ .

$a = \frac{5 c}{2} + \frac{- c \cdot 2}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.4.2

Combine the numerators over the common denominator.

$a = \frac{5 c - c \cdot 2}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{5 c - c \cdot 2}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.5

Simplify each term.

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Step 4.4.1.5.1

Simplify the numerator.

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Step 4.4.1.5.1.1

Factor $c$ out of $5 c - c \cdot 2$ .

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Step 4.4.1.5.1.1.1

Factor $c$ out of $5 c$ .

$a = \frac{c \cdot 5 - c \cdot 2}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.5.1.1.2

Factor $c$ out of $- c \cdot 2$ .

$a = \frac{c \cdot 5 + c (- 1 \cdot 2)}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.5.1.1.3

Factor $c$ out of $c \cdot 5 + c (- 1 \cdot 2)$ .

$a = \frac{c (5 - 1 \cdot 2)}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{c (5 - 1 \cdot 2)}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.5.1.2

Multiply $- 1$ by $2$ .

$a = \frac{c (5 - 2)}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.5.1.3

Subtract $2$ from $5$ .

$a = \frac{c \cdot 3}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{c \cdot 3}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 4.4.1.5.2

Move $3$ to the left of $c$ .

$a = \frac{3 c}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{3 c}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{3 c}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{3 c}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

$a = \frac{3 c}{2} - 165$

$- \frac{3 (9 c - 2150)}{40} = 60$

$b = - \frac{5 c}{2} + 405$

Step 5

Solve for $c$ in $- \frac{3 (9 c - 2150)}{40} = 60$ .

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Step 5.1

Multiply both sides of the equation by $- \frac{40}{3}$ .

$- \frac{40}{3} \cdot (- \frac{3 (9 c - 2150)}{40}) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2

Simplify both sides of the equation.

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Step 5.2.1

Simplify the left side.

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Step 5.2.1.1

Simplify $- \frac{40}{3} (- \frac{3 (9 c - 2150)}{40})$ .

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Step 5.2.1.1.1

Cancel the common factor of $40$ .

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Step 5.2.1.1.1.1

Move the leading negative in $- \frac{40}{3}$ into the numerator.

$\frac{- 40}{3} \cdot (- \frac{3 (9 c - 2150)}{40}) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.1.2

Move the leading negative in $- \frac{3 (9 c - 2150)}{40}$ into the numerator.

$\frac{- 40}{3} \cdot \frac{- 3 (9 c - 2150)}{40} = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.1.3

Factor $40$ out of $- 40$ .

$\frac{40 (- 1)}{3} \cdot \frac{- 3 (9 c - 2150)}{40} = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.1.4

Cancel the common factor.

$\frac{40 \cdot - 1}{3} \cdot \frac{- 3 (9 c - 2150)}{40} = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.1.5

Rewrite the expression.

$\frac{- 1}{3} \cdot (- 3 (9 c - 2150)) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$\frac{- 1}{3} \cdot (- 3 (9 c - 2150)) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.2

Cancel the common factor of $3$ .

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Step 5.2.1.1.2.1

Factor $3$ out of $- 3 (9 c - 2150)$ .

$\frac{- 1}{3} \cdot (3 (- (9 c - 2150))) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.2.2

Cancel the common factor.

$\frac{- 1}{3} \cdot (3 (- (9 c - 2150))) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.2.3

Rewrite the expression.

$9 c - 2150 = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.3

Multiply.

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Step 5.2.1.1.3.1

Multiply $- 1$ by $- 1$ .

$1 (9 c - 2150) = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.1.1.3.2

Multiply $9 c - 2150$ by $1$ .

$9 c - 2150 = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - \frac{40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.2

Simplify the right side.

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Step 5.2.2.1

Simplify $- \frac{40}{3} \cdot 60$ .

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Step 5.2.2.1.1

Cancel the common factor of $3$ .

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Step 5.2.2.1.1.1

Move the leading negative in $- \frac{40}{3}$ into the numerator.

$9 c - 2150 = \frac{- 40}{3} \cdot 60$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.2.1.1.2

Factor $3$ out of $60$ .

$9 c - 2150 = \frac{- 40}{3} \cdot (3 (20))$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.2.1.1.3

Cancel the common factor.

$9 c - 2150 = \frac{- 40}{3} \cdot (3 \cdot 20)$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.2.1.1.4

Rewrite the expression.

$9 c - 2150 = - 40 \cdot 20$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - 40 \cdot 20$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.2.2.1.2

Multiply $- 40$ by $20$ .

$9 c - 2150 = - 800$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - 800$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - 800$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c - 2150 = - 800$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.3

Move all terms not containing $c$ to the right side of the equation.

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Step 5.3.1

Add $2150$ to both sides of the equation.

$9 c = - 800 + 2150$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.3.2

Add $- 800$ and $2150$ .

$9 c = 1350$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$9 c = 1350$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.4

Divide each term in $9 c = 1350$ by $9$ and simplify.

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Step 5.4.1

Divide each term in $9 c = 1350$ by $9$ .

$\frac{9 c}{9} = \frac{1350}{9}$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.4.2

Simplify the left side.

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Step 5.4.2.1

Cancel the common factor of $9$ .

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Step 5.4.2.1.1

Cancel the common factor.

$\frac{9 c}{9} = \frac{1350}{9}$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.4.2.1.2

Divide $c$ by $1$ .

$c = \frac{1350}{9}$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$c = \frac{1350}{9}$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$c = \frac{1350}{9}$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 5.4.3

Simplify the right side.

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Step 5.4.3.1

Divide $1350$ by $9$ .

$c = 150$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$c = 150$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$c = 150$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

$c = 150$

$a = \frac{3 c}{2} - 165$

$b = - \frac{5 c}{2} + 405$

Step 6

Replace all occurrences of $c$ with $150$ in each equation.

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Step 6.1

Replace all occurrences of $c$ in $a = \frac{3 c}{2} - 165$ with $150$ .

$a = \frac{3 (150)}{2} - 165$

$c = 150$

$b = - \frac{5 c}{2} + 405$

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $\frac{3 (150)}{2} - 165$ .

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Step 6.2.1.1

Multiply $3$ by $150$ .

$a = \frac{450}{2} - 165$

$c = 150$

$b = - \frac{5 c}{2} + 405$

Step 6.2.1.2

Divide $450$ by $2$ .

$a = 225 - 165$

$c = 150$

$b = - \frac{5 c}{2} + 405$

Step 6.2.1.3

Subtract $165$ from $225$ .

$a = 60$

$c = 150$

$b = - \frac{5 c}{2} + 405$

$a = 60$

$c = 150$

$b = - \frac{5 c}{2} + 405$

$a = 60$

$c = 150$

$b = - \frac{5 c}{2} + 405$

Step 6.3

Replace all occurrences of $c$ in $b = - \frac{5 c}{2} + 405$ with $150$ .

$b = - \frac{5 (150)}{2} + 405$

$a = 60$

$c = 150$

Step 6.4

Simplify the right side.

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Step 6.4.1

Simplify $- \frac{5 (150)}{2} + 405$ .

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Step 6.4.1.1

Simplify each term.

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Step 6.4.1.1.1

Cancel the common factor of $150$ and $2$ .

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Step 6.4.1.1.1.1

Factor $2$ out of $5 (150)$ .

$b = - \frac{2 (5 \cdot (75))}{2} + 405$

$a = 60$

$c = 150$

Step 6.4.1.1.1.2

Cancel the common factors.

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Step 6.4.1.1.1.2.1

Factor $2$ out of $2$ .

$b = - \frac{2 (5 \cdot (75))}{2 (1)} + 405$

$a = 60$

$c = 150$

Step 6.4.1.1.1.2.2

Cancel the common factor.

$b = - \frac{2 (5 \cdot (75))}{2 \cdot 1} + 405$

$a = 60$

$c = 150$

Step 6.4.1.1.1.2.3

Rewrite the expression.

$b = - \frac{5 \cdot (75)}{1} + 405$

$a = 60$

$c = 150$

Step 6.4.1.1.1.2.4

Divide $5 \cdot (75)$ by $1$ .

$b = - (5 \cdot (75)) + 405$

$a = 60$

$c = 150$

$b = - (5 \cdot (75)) + 405$

$a = 60$

$c = 150$

$b = - (5 \cdot (75)) + 405$

$a = 60$

$c = 150$

Step 6.4.1.1.2

Multiply $- (5 \cdot (75))$ .

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Step 6.4.1.1.2.1

Multiply $5$ by $75$ .

$b = - 1 \cdot 375 + 405$

$a = 60$

$c = 150$

Step 6.4.1.1.2.2

Multiply $- 1$ by $375$ .

$b = - 375 + 405$

$a = 60$

$c = 150$

$b = - 375 + 405$

$a = 60$

$c = 150$

$b = - 375 + 405$

$a = 60$

$c = 150$

Step 6.4.1.2

Add $- 375$ and $405$ .

$b = 30$

$a = 60$

$c = 150$

$b = 30$

$a = 60$

$c = 150$

$b = 30$

$a = 60$

$c = 150$

$b = 30$

$a = 60$

$c = 150$

Step 7

List all of the solutions.

$b = 30, a = 60, c = 150$