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Simplifying 87 = 7(1 + 3m) + -4 87 = (1 * 7 + 3m * 7) + -4 87 = (7 + 21m) + -4 Reorder the terms: 87 = 7 + -4 + 21m Combine like terms: 7 + -4 = 3 87 = 3 + 21m Solving 87 = 3 + 21m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-21m' to each side of the equation. 87 + -21m = 3 + 21m + -21m Combine like terms: 21m + -21m = 0 87 + -21m = 3 + 0 87 + -21m = 3 Add '-87' to each side of the equation. 87 + -87 + -21m = 3 + -87 Combine like terms: 87 + -87 = 0 0 + -21m = 3 + -87 -21m = 3 + -87 Combine like terms: 3 + -87 = -84 -21m = -84 Divide each side by '-21'. m = 4 Simplifying m = 4
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