Basic Math Examples

$\frac{3 a + 7}{a - 6} = \frac{3 b - 7}{b - 6}$

Step 1

Multiply the numerator of the first fraction by the denominator of the second fraction. Set this equal to the product of the denominator of the first fraction and the numerator of the second fraction.

$(3 a + 7) (b - 6) = (a - 6) (3 b - 7)$

Step 2

Solve the equation for $a$ .

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Step 2.1

Simplify $(3 a + 7) (b - 6)$ .

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Step 2.1.1

Rewrite.

$0 + 0 + (3 a + 7) (b - 6) = (a - 6) (3 b - 7)$

Step 2.1.2

Simplify by adding zeros.

$(3 a + 7) (b - 6) = (a - 6) (3 b - 7)$

Step 2.1.3

Expand $(3 a + 7) (b - 6)$ using the FOIL Method.

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Step 2.1.3.1

Apply the distributive property.

$3 a (b - 6) + 7 (b - 6) = (a - 6) (3 b - 7)$

Step 2.1.3.2

Apply the distributive property.

$3 a b + 3 a \cdot - 6 + 7 (b - 6) = (a - 6) (3 b - 7)$

Step 2.1.3.3

Apply the distributive property.

$3 a b + 3 a \cdot - 6 + 7 b + 7 \cdot - 6 = (a - 6) (3 b - 7)$

Step 2.1.4

Simplify each term.

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Step 2.1.4.1

Multiply $- 6$ by $3$ .

$3 a b - 18 a + 7 b + 7 \cdot - 6 = (a - 6) (3 b - 7)$

Step 2.1.4.2

Multiply $7$ by $- 6$ .

$3 a b - 18 a + 7 b - 42 = (a - 6) (3 b - 7)$

Step 2.2

Simplify $(a - 6) (3 b - 7)$ .

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Step 2.2.1

Expand $(a - 6) (3 b - 7)$ using the FOIL Method.

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Step 2.2.1.1

Apply the distributive property.

$3 a b - 18 a + 7 b - 42 = a (3 b - 7) - 6 (3 b - 7)$

Step 2.2.1.2

Apply the distributive property.

$3 a b - 18 a + 7 b - 42 = a (3 b) + a \cdot - 7 - 6 (3 b - 7)$

Step 2.2.1.3

Apply the distributive property.

$3 a b - 18 a + 7 b - 42 = a (3 b) + a \cdot - 7 - 6 (3 b) - 6 \cdot - 7$

Step 2.2.2

Simplify each term.

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Step 2.2.2.1

Rewrite using the commutative property of multiplication.

$3 a b - 18 a + 7 b - 42 = 3 a b + a \cdot - 7 - 6 (3 b) - 6 \cdot - 7$

Step 2.2.2.2

Move $- 7$ to the left of $a$ .

$3 a b - 18 a + 7 b - 42 = 3 a b - 7 \cdot a - 6 (3 b) - 6 \cdot - 7$

Step 2.2.2.3

Multiply $3$ by $- 6$ .

$3 a b - 18 a + 7 b - 42 = 3 a b - 7 a - 18 b - 6 \cdot - 7$

Step 2.2.2.4

Multiply $- 6$ by $- 7$ .

$3 a b - 18 a + 7 b - 42 = 3 a b - 7 a - 18 b + 42$

Step 2.3

Move all terms containing $a$ to the left side of the equation.

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Step 2.3.1

Subtract $3 a b$ from both sides of the equation.

$3 a b - 18 a + 7 b - 42 - 3 a b = - 7 a - 18 b + 42$

Step 2.3.2

Add $7 a$ to both sides of the equation.

$3 a b - 18 a + 7 b - 42 - 3 a b + 7 a = - 18 b + 42$

Step 2.3.3

Combine the opposite terms in $3 a b - 18 a + 7 b - 42 - 3 a b + 7 a$ .

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Step 2.3.3.1

Subtract $3 a b$ from $3 a b$ .

$- 18 a + 7 b - 42 + 0 + 7 a = - 18 b + 42$

Step 2.3.3.2

Add $- 18 a + 7 b - 42$ and $0$ .

$- 18 a + 7 b - 42 + 7 a = - 18 b + 42$

Step 2.3.4

Add $- 18 a$ and $7 a$ .

$- 11 a + 7 b - 42 = - 18 b + 42$

Step 2.4

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

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Step 2.4.1

Subtract $7 b$ from both sides of the equation.

$- 11 a - 42 = - 18 b + 42 - 7 b$

Step 2.4.2

Add $42$ to both sides of the equation.

$- 11 a = - 18 b + 42 - 7 b + 42$

Step 2.4.3

Subtract $7 b$ from $- 18 b$ .

$- 11 a = - 25 b + 42 + 42$

Step 2.4.4

Add $42$ and $42$ .

$- 11 a = - 25 b + 84$

Step 2.5

Divide each term in $- 11 a = - 25 b + 84$ by $- 11$ and simplify.

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Step 2.5.1

Divide each term in $- 11 a = - 25 b + 84$ by $- 11$ .

$\frac{- 11 a}{- 11} = \frac{- 25 b}{- 11} + \frac{84}{- 11}$

Step 2.5.2

Simplify the left side.

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Step 2.5.2.1

Cancel the common factor of $- 11$ .

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Step 2.5.2.1.1

Cancel the common factor.

$\frac{- 11 a}{- 11} = \frac{- 25 b}{- 11} + \frac{84}{- 11}$

Step 2.5.2.1.2

Divide $a$ by $1$ .

$a = \frac{- 25 b}{- 11} + \frac{84}{- 11}$

Step 2.5.3

Simplify the right side.

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Step 2.5.3.1

Simplify each term.

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Step 2.5.3.1.1

Dividing two negative values results in a positive value.

$a = \frac{25 b}{11} + \frac{84}{- 11}$

Step 2.5.3.1.2

Move the negative in front of the fraction.

$a = \frac{25 b}{11} - \frac{84}{11}$