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Simplifying 7m + 7(-4 + 2m) = 140 7m + (-4 * 7 + 2m * 7) = 140 7m + (-28 + 14m) = 140 Reorder the terms: -28 + 7m + 14m = 140 Combine like terms: 7m + 14m = 21m -28 + 21m = 140 Solving -28 + 21m = 140 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 21m = 140 + 28 Combine like terms: -28 + 28 = 0 0 + 21m = 140 + 28 21m = 140 + 28 Combine like terms: 140 + 28 = 168 21m = 168 Divide each side by '21'. m = 8 Simplifying m = 8
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