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