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Simplifying -20 + -1(-4m) = (-5m) + -1(-15) Remove parenthesis around (-4m) -20 + -1 * -4m = (-5m) + -1(-15) Multiply -1 * -4 -20 + 4m = (-5m) + -1(-15) Multiply -1 * -15 -20 + 4m = (-5m) + 15 Reorder the terms: -20 + 4m = 15 + (-5m) Solving -20 + 4m = 15 + (-5m) Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '(5m)' to each side of the equation. -20 + 4m + (5m) = 15 + (-5m) + (5m) Combine like terms: 4m + (5m) = 9m -20 + 9m = 15 + (-5m) + (5m) Combine like terms: (-5m) + (5m) = 0 -20 + 9m = 15 + 0 -20 + 9m = 15 Add '20' to each side of the equation. -20 + 20 + 9m = 15 + 20 Combine like terms: -20 + 20 = 0 0 + 9m = 15 + 20 9m = 15 + 20 Combine like terms: 15 + 20 = 35 9m = 35 Divide each side by '9'. m = 3.888888889 Simplifying m = 3.888888889
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