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Simplifying 21 + 20m = 42 + 13m Solving 21 + 20m = 42 + 13m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-13m' to each side of the equation. 21 + 20m + -13m = 42 + 13m + -13m Combine like terms: 20m + -13m = 7m 21 + 7m = 42 + 13m + -13m Combine like terms: 13m + -13m = 0 21 + 7m = 42 + 0 21 + 7m = 42 Add '-21' to each side of the equation. 21 + -21 + 7m = 42 + -21 Combine like terms: 21 + -21 = 0 0 + 7m = 42 + -21 7m = 42 + -21 Combine like terms: 42 + -21 = 21 7m = 21 Divide each side by '7'. m = 3 Simplifying m = 3
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