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Simplifying 21 = 7 + 3m + -1m Combine like terms: 3m + -1m = 2m 21 = 7 + 2m Solving 21 = 7 + 2m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-2m' to each side of the equation. 21 + -2m = 7 + 2m + -2m Combine like terms: 2m + -2m = 0 21 + -2m = 7 + 0 21 + -2m = 7 Add '-21' to each side of the equation. 21 + -21 + -2m = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2m = 7 + -21 -2m = 7 + -21 Combine like terms: 7 + -21 = -14 -2m = -14 Divide each side by '-2'. m = 7 Simplifying m = 7
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