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Simplifying 4(m + 3) + -2m = 21 Reorder the terms: 4(3 + m) + -2m = 21 (3 * 4 + m * 4) + -2m = 21 (12 + 4m) + -2m = 21 Combine like terms: 4m + -2m = 2m 12 + 2m = 21 Solving 12 + 2m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 2m = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 2m = 21 + -12 2m = 21 + -12 Combine like terms: 21 + -12 = 9 2m = 9 Divide each side by '2'. m = 4.5 Simplifying m = 4.5
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