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Simplifying 3m + 7m + -7 + 3m = 21 Reorder the terms: -7 + 3m + 7m + 3m = 21 Combine like terms: 3m + 7m = 10m -7 + 10m + 3m = 21 Combine like terms: 10m + 3m = 13m -7 + 13m = 21 Solving -7 + 13m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 13m = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 13m = 21 + 7 13m = 21 + 7 Combine like terms: 21 + 7 = 28 13m = 28 Divide each side by '13'. m = 2.153846154 Simplifying m = 2.153846154
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