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Simplifying 15 + 4(1m + -2) = 21 Reorder the terms: 15 + 4(-2 + 1m) = 21 15 + (-2 * 4 + 1m * 4) = 21 15 + (-8 + 4m) = 21 Combine like terms: 15 + -8 = 7 7 + 4m = 21 Solving 7 + 4m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 4m = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 4m = 21 + -7 4m = 21 + -7 Combine like terms: 21 + -7 = 14 4m = 14 Divide each side by '4'. m = 3.5 Simplifying m = 3.5
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