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Simplifying 21m + -13m + 15 = 31 Reorder the terms: 15 + 21m + -13m = 31 Combine like terms: 21m + -13m = 8m 15 + 8m = 31 Solving 15 + 8m = 31 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 8m = 31 + -15 Combine like terms: 15 + -15 = 0 0 + 8m = 31 + -15 8m = 31 + -15 Combine like terms: 31 + -15 = 16 8m = 16 Divide each side by '8'. m = 2 Simplifying m = 2
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