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