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Simplifying (3 + m) + (2m + -4) = 12 Remove parenthesis around (3 + m) 3 + m + (2m + -4) = 12 Reorder the terms: 3 + m + (-4 + 2m) = 12 Remove parenthesis around (-4 + 2m) 3 + m + -4 + 2m = 12 Reorder the terms: 3 + -4 + m + 2m = 12 Combine like terms: 3 + -4 = -1 -1 + m + 2m = 12 Combine like terms: m + 2m = 3m -1 + 3m = 12 Solving -1 + 3m = 12 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 3m = 12 + 1 Combine like terms: -1 + 1 = 0 0 + 3m = 12 + 1 3m = 12 + 1 Combine like terms: 12 + 1 = 13 3m = 13 Divide each side by '3'. m = 4.333333333 Simplifying m = 4.333333333
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