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Simplifying 9m + 21 = 15m + -21 Reorder the terms: 21 + 9m = 15m + -21 Reorder the terms: 21 + 9m = -21 + 15m Solving 21 + 9m = -21 + 15m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-15m' to each side of the equation. 21 + 9m + -15m = -21 + 15m + -15m Combine like terms: 9m + -15m = -6m 21 + -6m = -21 + 15m + -15m Combine like terms: 15m + -15m = 0 21 + -6m = -21 + 0 21 + -6m = -21 Add '-21' to each side of the equation. 21 + -21 + -6m = -21 + -21 Combine like terms: 21 + -21 = 0 0 + -6m = -21 + -21 -6m = -21 + -21 Combine like terms: -21 + -21 = -42 -6m = -42 Divide each side by '-6'. m = 7 Simplifying m = 7
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