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Simplifying 2(m + -3) + 7 = 21 Reorder the terms: 2(-3 + m) + 7 = 21 (-3 * 2 + m * 2) + 7 = 21 (-6 + 2m) + 7 = 21 Reorder the terms: -6 + 7 + 2m = 21 Combine like terms: -6 + 7 = 1 1 + 2m = 21 Solving 1 + 2m = 21 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 + 2m = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 2m = 21 + -1 2m = 21 + -1 Combine like terms: 21 + -1 = 20 2m = 20 Divide each side by '2'. m = 10 Simplifying m = 10
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