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Simplifying 6m + -9 = 3m + 21 Reorder the terms: -9 + 6m = 3m + 21 Reorder the terms: -9 + 6m = 21 + 3m Solving -9 + 6m = 21 + 3m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-3m' to each side of the equation. -9 + 6m + -3m = 21 + 3m + -3m Combine like terms: 6m + -3m = 3m -9 + 3m = 21 + 3m + -3m Combine like terms: 3m + -3m = 0 -9 + 3m = 21 + 0 -9 + 3m = 21 Add '9' to each side of the equation. -9 + 9 + 3m = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 3m = 21 + 9 3m = 21 + 9 Combine like terms: 21 + 9 = 30 3m = 30 Divide each side by '3'. m = 10 Simplifying m = 10
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