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Simplifying 21 = -7m Solving 21 = -7m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '7m' to each side of the equation. 21 + 7m = -7m + 7m Combine like terms: -7m + 7m = 0 21 + 7m = 0 Add '-21' to each side of the equation. 21 + -21 + 7m = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7m = 0 + -21 7m = 0 + -21 Combine like terms: 0 + -21 = -21 7m = -21 Divide each side by '7'. m = -3 Simplifying m = -3
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