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Simplifying 21 = 1 + -7m + 2m Combine like terms: -7m + 2m = -5m 21 = 1 + -5m Solving 21 = 1 + -5m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '5m' to each side of the equation. 21 + 5m = 1 + -5m + 5m Combine like terms: -5m + 5m = 0 21 + 5m = 1 + 0 21 + 5m = 1 Add '-21' to each side of the equation. 21 + -21 + 5m = 1 + -21 Combine like terms: 21 + -21 = 0 0 + 5m = 1 + -21 5m = 1 + -21 Combine like terms: 1 + -21 = -20 5m = -20 Divide each side by '5'. m = -4 Simplifying m = -4
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