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Simplifying 9 = -3(21 + -1m) + (2m + -4) 9 = (21 * -3 + -1m * -3) + (2m + -4) 9 = (-63 + 3m) + (2m + -4) Reorder the terms: 9 = -63 + 3m + (-4 + 2m) Remove parenthesis around (-4 + 2m) 9 = -63 + 3m + -4 + 2m Reorder the terms: 9 = -63 + -4 + 3m + 2m Combine like terms: -63 + -4 = -67 9 = -67 + 3m + 2m Combine like terms: 3m + 2m = 5m 9 = -67 + 5m Solving 9 = -67 + 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. 9 + -5m = -67 + 5m + -5m Combine like terms: 5m + -5m = 0 9 + -5m = -67 + 0 9 + -5m = -67 Add '-9' to each side of the equation. 9 + -9 + -5m = -67 + -9 Combine like terms: 9 + -9 = 0 0 + -5m = -67 + -9 -5m = -67 + -9 Combine like terms: -67 + -9 = -76 -5m = -76 Divide each side by '-5'. m = 15.2 Simplifying m = 15.2
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