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Simplifying 39 = -3m + -21 + m Reorder the terms: 39 = -21 + -3m + m Combine like terms: -3m + m = -2m 39 = -21 + -2m Solving 39 = -21 + -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. 39 + 2m = -21 + -2m + 2m Combine like terms: -2m + 2m = 0 39 + 2m = -21 + 0 39 + 2m = -21 Add '-39' to each side of the equation. 39 + -39 + 2m = -21 + -39 Combine like terms: 39 + -39 = 0 0 + 2m = -21 + -39 2m = -21 + -39 Combine like terms: -21 + -39 = -60 2m = -60 Divide each side by '2'. m = -30 Simplifying m = -30
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