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Simplifying 3m + -7m + 13 = 21 Reorder the terms: 13 + 3m + -7m = 21 Combine like terms: 3m + -7m = -4m 13 + -4m = 21 Solving 13 + -4m = 21 Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -4m = 21 + -13 Combine like terms: 13 + -13 = 0 0 + -4m = 21 + -13 -4m = 21 + -13 Combine like terms: 21 + -13 = 8 -4m = 8 Divide each side by '-4'. m = -2 Simplifying m = -2
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