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Simplifying 21 = -2m + 5m Combine like terms: -2m + 5m = 3m 21 = 3m Solving 21 = 3m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-3m' to each side of the equation. 21 + -3m = 3m + -3m Combine like terms: 3m + -3m = 0 21 + -3m = 0 Add '-21' to each side of the equation. 21 + -21 + -3m = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3m = 0 + -21 -3m = 0 + -21 Combine like terms: 0 + -21 = -21 -3m = -21 Divide each side by '-3'. m = 7 Simplifying m = 7
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