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Simplifying (7m + -21) + (m + 4) = 15 Reorder the terms: (-21 + 7m) + (m + 4) = 15 Remove parenthesis around (-21 + 7m) -21 + 7m + (m + 4) = 15 Reorder the terms: -21 + 7m + (4 + m) = 15 Remove parenthesis around (4 + m) -21 + 7m + 4 + m = 15 Reorder the terms: -21 + 4 + 7m + m = 15 Combine like terms: -21 + 4 = -17 -17 + 7m + m = 15 Combine like terms: 7m + m = 8m -17 + 8m = 15 Solving -17 + 8m = 15 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '17' to each side of the equation. -17 + 17 + 8m = 15 + 17 Combine like terms: -17 + 17 = 0 0 + 8m = 15 + 17 8m = 15 + 17 Combine like terms: 15 + 17 = 32 8m = 32 Divide each side by '8'. m = 4 Simplifying m = 4
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