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Simplifying 21 = 9 + -2m Solving 21 = 9 + -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 = 9 + -2m + 2m Combine like terms: -2m + 2m = 0 21 + 2m = 9 + 0 21 + 2m = 9 Add '-21' to each side of the equation. 21 + -21 + 2m = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 2m = 9 + -21 2m = 9 + -21 Combine like terms: 9 + -21 = -12 2m = -12 Divide each side by '2'. m = -6 Simplifying m = -6
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