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Simplifying 21 + 3m = 40 + m Solving 21 + 3m = 40 + m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-1m' to each side of the equation. 21 + 3m + -1m = 40 + m + -1m Combine like terms: 3m + -1m = 2m 21 + 2m = 40 + m + -1m Combine like terms: m + -1m = 0 21 + 2m = 40 + 0 21 + 2m = 40 Add '-21' to each side of the equation. 21 + -21 + 2m = 40 + -21 Combine like terms: 21 + -21 = 0 0 + 2m = 40 + -21 2m = 40 + -21 Combine like terms: 40 + -21 = 19 2m = 19 Divide each side by '2'. m = 9.5 Simplifying m = 9.5
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