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Simplifying 21 = -7m + 4m Combine like terms: -7m + 4m = -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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