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Simplifying -21 = -1m + -2m Combine like terms: -1m + -2m = -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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