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Simplifying 7(m + 15) = 21 Reorder the terms: 7(15 + m) = 21 (15 * 7 + m * 7) = 21 (105 + 7m) = 21 Solving 105 + 7m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-105' to each side of the equation. 105 + -105 + 7m = 21 + -105 Combine like terms: 105 + -105 = 0 0 + 7m = 21 + -105 7m = 21 + -105 Combine like terms: 21 + -105 = -84 7m = -84 Divide each side by '7'. m = -12 Simplifying m = -12
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