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Simplifying m + 3m + -3 + 3(2m + 1) = 21 Reorder the terms: m + 3m + -3 + 3(1 + 2m) = 21 m + 3m + -3 + (1 * 3 + 2m * 3) = 21 m + 3m + -3 + (3 + 6m) = 21 Reorder the terms: -3 + 3 + m + 3m + 6m = 21 Combine like terms: -3 + 3 = 0 0 + m + 3m + 6m = 21 m + 3m + 6m = 21 Combine like terms: m + 3m = 4m 4m + 6m = 21 Combine like terms: 4m + 6m = 10m 10m = 21 Solving 10m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Divide each side by '10'. m = 2.1 Simplifying m = 2.1
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