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Simplifying -20 = -9 + -1(-1m) Remove parenthesis around (-1m) -20 = -9 + -1 * -1m Multiply -1 * -1 -20 = -9 + 1m Solving -20 = -9 + 1m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1m' to each side of the equation. -20 + -1m = -9 + 1m + -1m Combine like terms: 1m + -1m = 0 -20 + -1m = -9 + 0 -20 + -1m = -9 Add '20' to each side of the equation. -20 + 20 + -1m = -9 + 20 Combine like terms: -20 + 20 = 0 0 + -1m = -9 + 20 -1m = -9 + 20 Combine like terms: -9 + 20 = 11 -1m = 11 Divide each side by '-1'. m = -11 Simplifying m = -11
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