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Simplifying m + (m + 3) = 90 Reorder the terms: m + (3 + m) = 90 Remove parenthesis around (3 + m) m + 3 + m = 90 Reorder the terms: 3 + m + m = 90 Combine like terms: m + m = 2m 3 + 2m = 90 Solving 3 + 2m = 90 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2m = 90 + -3 Combine like terms: 3 + -3 = 0 0 + 2m = 90 + -3 2m = 90 + -3 Combine like terms: 90 + -3 = 87 2m = 87 Divide each side by '2'. m = 43.5 Simplifying m = 43.5
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