Finite Math Examples

$\frac{0.9 S}{(S - 1) (S + 0.2)} = \frac{A}{S - 0.1} + \frac{B}{S + 0.2}$

Step 1

Move all the expressions to the left side of the equation.

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Step 1.1

Subtract $\frac{A}{S - 0.1}$ from both sides of the equation.

$\frac{0.9 S}{(S - 1) (S + 0.2)} - \frac{A}{S - 0.1} = \frac{B}{S + 0.2}$

Step 1.2

Subtract $\frac{B}{S + 0.2}$ from both sides of the equation.

$\frac{0.9 S}{(S - 1) (S + 0.2)} - \frac{A}{S - 0.1} - \frac{B}{S + 0.2} = 0$

Step 2

Simplify $\frac{0.9 S}{(S - 1) (S + 0.2)} - \frac{A}{S - 0.1} - \frac{B}{S + 0.2}$ .

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Step 2.1

To write $\frac{0.9 S}{(S - 1) (S + 0.2)}$ as a fraction with a common denominator, multiply by $\frac{S - 0.1}{S - 0.1}$ .

$\frac{0.9 S}{(S - 1) (S + 0.2)} \cdot \frac{S - 0.1}{S - 0.1} - \frac{A}{S - 0.1} - \frac{B}{S + 0.2} = 0$

Step 2.2

To write $- \frac{A}{S - 0.1}$ as a fraction with a common denominator, multiply by $\frac{(S - 1) (S + 0.2)}{(S - 1) (S + 0.2)}$ .

$\frac{0.9 S}{(S - 1) (S + 0.2)} \cdot \frac{S - 0.1}{S - 0.1} - \frac{A}{S - 0.1} \cdot \frac{(S - 1) (S + 0.2)}{(S - 1) (S + 0.2)} - \frac{B}{S + 0.2} = 0$

Step 2.3

Write each expression with a common denominator of $(S - 1) (S + 0.2) (S - 0.1)$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.3.1

Multiply $\frac{0.9 S}{(S - 1) (S + 0.2)}$ by $\frac{S - 0.1}{S - 0.1}$ .

$\frac{0.9 S (S - 0.1)}{(S - 1) (S + 0.2) (S - 0.1)} - \frac{A}{S - 0.1} \cdot \frac{(S - 1) (S + 0.2)}{(S - 1) (S + 0.2)} - \frac{B}{S + 0.2} = 0$

Step 2.3.2

Multiply $\frac{A}{S - 0.1}$ by $\frac{(S - 1) (S + 0.2)}{(S - 1) (S + 0.2)}$ .

$\frac{0.9 S (S - 0.1)}{(S - 1) (S + 0.2) (S - 0.1)} - \frac{A ((S - 1) (S + 0.2))}{(S - 0.1) ((S - 1) (S + 0.2))} - \frac{B}{S + 0.2} = 0$

Step 2.3.3

Reorder the factors of $(S - 1) (S + 0.2) (S - 0.1)$ .

$\frac{0.9 S (S - 0.1)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{A ((S - 1) (S + 0.2))}{(S - 0.1) ((S - 1) (S + 0.2))} - \frac{B}{S + 0.2} = 0$

Step 2.3.4

Reorder the factors of $(S - 0.1) ((S - 1) (S + 0.2))$ .

$\frac{0.9 S (S - 0.1)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{A ((S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.4

Combine the numerators over the common denominator.

$\frac{0.9 S (S - 0.1) - A ((S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5

Simplify the numerator.

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Step 2.5.1

Factor $0.1$ out of $0.9 S (S - 0.1) - A (S - 1) (S + 0.2)$ .

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Step 2.5.1.1

Factor $0.1$ out of $0.9 S (S - 0.1)$ .

$\frac{0.1 (9 S (S - 0.1)) - A (S - 1) (S + 0.2)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.1.2

Factor $0.1$ out of $- A (S - 1) (S + 0.2)$ .

$\frac{0.1 (9 S (S - 0.1)) + 0.1 (- 10 A (S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.1.3

Factor $0.1$ out of $0.1 (9 S (S - 0.1)) + 0.1 (- 10 A (S - 1) (S + 0.2))$ .

$\frac{0.1 (9 S (S - 0.1) - 10 A (S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.2

Apply the distributive property.

$\frac{0.1 (9 S \cdot S + 9 S \cdot - 0.1 - 10 A (S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.3

Multiply $S$ by $S$ by adding the exponents.

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Step 2.5.3.1

Move $S$ .

$\frac{0.1 (9 (S \cdot S) + 9 S \cdot - 0.1 - 10 A (S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.3.2

Multiply $S$ by $S$ .

$\frac{0.1 (9 S^{2} + 9 S \cdot - 0.1 - 10 A (S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.4

Multiply $- 0.1$ by $9$ .

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A (S - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.5

Apply the distributive property.

$\frac{0.1 (9 S^{2} - 0.9 S + (- 10 A S - 10 A \cdot - 1) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.6

Multiply $- 1$ by $- 10$ .

$\frac{0.1 (9 S^{2} - 0.9 S + (- 10 A S + 10 A) (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.7

Expand $(- 10 A S + 10 A) (S + 0.2)$ using the FOIL Method.

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Step 2.5.7.1

Apply the distributive property.

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S (S + 0.2) + 10 A (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.7.2

Apply the distributive property.

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S \cdot S - 10 A S \cdot 0.2 + 10 A (S + 0.2))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.7.3

Apply the distributive property.

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S \cdot S - 10 A S \cdot 0.2 + 10 A S + 10 A \cdot 0.2)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.8

Simplify and combine like terms.

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Step 2.5.8.1

Simplify each term.

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Step 2.5.8.1.1

Multiply $S$ by $S$ by adding the exponents.

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Step 2.5.8.1.1.1

Move $S$ .

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A (S \cdot S) - 10 A S \cdot 0.2 + 10 A S + 10 A \cdot 0.2)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.8.1.1.2

Multiply $S$ by $S$ .

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S^{2} - 10 A S \cdot 0.2 + 10 A S + 10 A \cdot 0.2)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.8.1.2

Multiply $0.2$ by $- 10$ .

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S^{2} - 2 A S + 10 A S + 10 A \cdot 0.2)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.8.1.3

Multiply $0.2$ by $10$ .

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S^{2} - 2 A S + 10 A S + 2 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.8.2

Add $- 2 A S$ and $10 A S$ .

$\frac{0.1 (9 S^{2} - 0.9 S - 10 A S^{2} + 8 A S + 2 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9

Factor $0.1$ out of $9 S^{2} - 0.9 S - 10 A S^{2} + 8 A S + 2 A$ .

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Step 2.5.9.1

Factor $0.1$ out of $9 S^{2}$ .

$\frac{0.1 (0.1 (90 S^{2}) - 0.9 S - 10 A S^{2} + 8 A S + 2 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.2

Factor $0.1$ out of $- 0.9 S$ .

$\frac{0.1 (0.1 (90 S^{2}) + 0.1 (- 9 S) - 10 A S^{2} + 8 A S + 2 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.3

Factor $0.1$ out of $- 10 A S^{2}$ .

$\frac{0.1 (0.1 (90 S^{2}) + 0.1 (- 9 S) + 0.1 (- 100 A S^{2}) + 8 A S + 2 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.4

Factor $0.1$ out of $8 A S$ .

$\frac{0.1 (0.1 (90 S^{2}) + 0.1 (- 9 S) + 0.1 (- 100 A S^{2}) + 0.1 (80 A S) + 2 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.5

Factor $0.1$ out of $2 A$ .

$\frac{0.1 (0.1 (90 S^{2}) + 0.1 (- 9 S) + 0.1 (- 100 A S^{2}) + 0.1 (80 A S) + 0.1 (20 A))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.6

Factor $0.1$ out of $0.1 (90 S^{2}) + 0.1 (- 9 S)$ .

$\frac{0.1 (0.1 (90 S^{2} - 9 S) + 0.1 (- 100 A S^{2}) + 0.1 (80 A S) + 0.1 (20 A))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.7

Factor $0.1$ out of $0.1 (90 S^{2} - 9 S) + 0.1 (- 100 A S^{2})$ .

$\frac{0.1 (0.1 (90 S^{2} - 9 S - 100 A S^{2}) + 0.1 (80 A S) + 0.1 (20 A))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.8

Factor $0.1$ out of $0.1 (90 S^{2} - 9 S - 100 A S^{2}) + 0.1 (80 A S)$ .

$\frac{0.1 (0.1 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S) + 0.1 (20 A))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.9.9

Factor $0.1$ out of $0.1 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S) + 0.1 (20 A)$ .

$\frac{0.1 (0.1 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A))}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

$\frac{0.1 \cdot 0.1 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.5.10

Multiply $0.1$ by $0.1$ .

$\frac{0.01 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} = 0$

Step 2.6

To write $- \frac{B}{S + 0.2}$ as a fraction with a common denominator, multiply by $\frac{(S - 0.1) (S - 1)}{(S - 0.1) (S - 1)}$ .

$\frac{0.01 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B}{S + 0.2} \cdot \frac{(S - 0.1) (S - 1)}{(S - 0.1) (S - 1)} = 0$

Step 2.7

Write each expression with a common denominator of $(S + 0.2) (S - 0.1) (S - 1)$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.7.1

Multiply $\frac{B}{S + 0.2}$ by $\frac{(S - 0.1) (S - 1)}{(S - 0.1) (S - 1)}$ .

$\frac{0.01 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B ((S - 0.1) (S - 1))}{(S + 0.2) ((S - 0.1) (S - 1))} = 0$

Step 2.7.2

Reorder the factors of $(S + 0.2) ((S - 0.1) (S - 1))$ .

$\frac{0.01 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A)}{(S + 0.2) (S - 0.1) (S - 1)} - \frac{B ((S - 0.1) (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.8

Combine the numerators over the common denominator.

$\frac{0.01 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A) - B ((S - 0.1) (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9

Simplify the numerator.

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Step 2.9.1

Factor $0.01$ out of $0.01 (90 S^{2} - 9 S - 100 A S^{2} + 80 A S + 20 A) - B (S - 0.1) (S - 1)$ .

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Step 2.9.1.1

Reorder the expression.

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Step 2.9.1.1.1

Move $- 9 S$ .

$\frac{0.01 (90 S^{2} - 100 A S^{2} + 80 A S + 20 A - 9 S) - B (S - 0.1) (S - 1)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.1.1.2

Move $90 S^{2}$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S) - B (S - 0.1) (S - 1)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.1.2

Factor $0.01$ out of $- B (S - 0.1) (S - 1)$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S) + 0.01 (- 100 B (S - 0.1) (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.1.3

Factor $0.01$ out of $0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S) + 0.01 (- 100 B (S - 0.1) (S - 1))$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B (S - 0.1) (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.2

Apply the distributive property.

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S + (- 100 B S - 100 B \cdot - 0.1) (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.3

Multiply $- 0.1$ by $- 100$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S + (- 100 B S + 10 B) (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.4

Expand $(- 100 B S + 10 B) (S - 1)$ using the FOIL Method.

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Step 2.9.4.1

Apply the distributive property.

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S (S - 1) + 10 B (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.4.2

Apply the distributive property.

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S \cdot S - 100 B S \cdot - 1 + 10 B (S - 1))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.4.3

Apply the distributive property.

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S \cdot S - 100 B S \cdot - 1 + 10 B S + 10 B \cdot - 1)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.5

Simplify and combine like terms.

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Step 2.9.5.1

Simplify each term.

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Step 2.9.5.1.1

Multiply $S$ by $S$ by adding the exponents.

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Step 2.9.5.1.1.1

Move $S$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B (S \cdot S) - 100 B S \cdot - 1 + 10 B S + 10 B \cdot - 1)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.5.1.1.2

Multiply $S$ by $S$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S^{2} - 100 B S \cdot - 1 + 10 B S + 10 B \cdot - 1)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.5.1.2

Multiply $- 1$ by $- 100$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S^{2} + 100 B S + 10 B S + 10 B \cdot - 1)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.5.1.3

Multiply $- 1$ by $10$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S^{2} + 100 B S + 10 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.9.5.2

Add $100 B S$ and $10 B S$ .

$\frac{0.01 (- 100 A S^{2} + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.10

Factor $- 1$ out of $- 100 A S^{2}$ .

$\frac{0.01 (- (100 A S^{2}) + 80 A S + 90 S^{2} + 20 A - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.11

Factor $- 1$ out of $80 A S$ .

$\frac{0.01 (- (100 A S^{2}) - (- 80 A S) + 90 S^{2} + 20 A - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.12

Factor $- 1$ out of $- (100 A S^{2}) - (- 80 A S)$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S) + 90 S^{2} + 20 A - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.13

Factor $- 1$ out of $90 S^{2}$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S) - (- 90 S^{2}) + 20 A - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.14

Factor $- 1$ out of $- (100 A S^{2} - 80 A S) - (- 90 S^{2})$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2}) + 20 A - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.15

Factor $- 1$ out of $20 A$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2}) - (- 20 A) - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.16

Factor $- 1$ out of $- (100 A S^{2} - 80 A S - 90 S^{2}) - (- 20 A)$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A) - 9 S - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.17

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

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A) - (9 S) - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.18

Factor $- 1$ out of $- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A) - (9 S)$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S) - 100 B S^{2} + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.19

Factor $- 1$ out of $- 100 B S^{2}$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S) - (100 B S^{2}) + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.20

Factor $- 1$ out of $- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S) - (100 B S^{2})$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2}) + 110 B S - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.21

Factor $- 1$ out of $110 B S$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2}) - (- 110 B S) - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.22

Factor $- 1$ out of $- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2}) - (- 110 B S)$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S) - 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.23

Factor $- 1$ out of $- 10 B$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S) - (10 B))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.24

Factor $- 1$ out of $- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S) - (10 B)$ .

$\frac{0.01 (- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S + 10 B))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.25

Rewrite $- (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S + 10 B)$ as $- 1 (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S + 10 B)$ .

$\frac{0.01 (- 1 (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S + 10 B))}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 2.26

Move the negative in front of the fraction.

$- \frac{0.01 (100 A S^{2} - 80 A S - 90 S^{2} - 20 A + 9 S + 100 B S^{2} - 110 B S + 10 B)}{(S + 0.2) (S - 0.1) (S - 1)} = 0$

Step 3

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.