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Simplifying 4(m + -3) + -1(m + -3) = 21 Reorder the terms: 4(-3 + m) + -1(m + -3) = 21 (-3 * 4 + m * 4) + -1(m + -3) = 21 (-12 + 4m) + -1(m + -3) = 21 Reorder the terms: -12 + 4m + -1(-3 + m) = 21 -12 + 4m + (-3 * -1 + m * -1) = 21 -12 + 4m + (3 + -1m) = 21 Reorder the terms: -12 + 3 + 4m + -1m = 21 Combine like terms: -12 + 3 = -9 -9 + 4m + -1m = 21 Combine like terms: 4m + -1m = 3m -9 + 3m = 21 Solving -9 + 3m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 3m = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 3m = 21 + 9 3m = 21 + 9 Combine like terms: 21 + 9 = 30 3m = 30 Divide each side by '3'. m = 10 Simplifying m = 10
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