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Simplifying 3m + 21 + -9m = -15 Reorder the terms: 21 + 3m + -9m = -15 Combine like terms: 3m + -9m = -6m 21 + -6m = -15 Solving 21 + -6m = -15 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -6m = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -6m = -15 + -21 -6m = -15 + -21 Combine like terms: -15 + -21 = -36 -6m = -36 Divide each side by '-6'. m = 6 Simplifying m = 6
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