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Simplifying 21 = 31 + -4m Solving 21 = 31 + -4m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '4m' to each side of the equation. 21 + 4m = 31 + -4m + 4m Combine like terms: -4m + 4m = 0 21 + 4m = 31 + 0 21 + 4m = 31 Add '-21' to each side of the equation. 21 + -21 + 4m = 31 + -21 Combine like terms: 21 + -21 = 0 0 + 4m = 31 + -21 4m = 31 + -21 Combine like terms: 31 + -21 = 10 4m = 10 Divide each side by '4'. m = 2.5 Simplifying m = 2.5
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