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Simplifying 21 = -5m + -3(4 + -2m) 21 = -5m + (4 * -3 + -2m * -3) 21 = -5m + (-12 + 6m) Reorder the terms: 21 = -12 + -5m + 6m Combine like terms: -5m + 6m = 1m 21 = -12 + 1m Solving 21 = -12 + 1m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1m' to each side of the equation. 21 + -1m = -12 + 1m + -1m Combine like terms: 1m + -1m = 0 21 + -1m = -12 + 0 21 + -1m = -12 Add '-21' to each side of the equation. 21 + -21 + -1m = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -1m = -12 + -21 -1m = -12 + -21 Combine like terms: -12 + -21 = -33 -1m = -33 Divide each side by '-1'. m = 33 Simplifying m = 33
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