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Simplifying 4m + -21 = 21 + 2m Reorder the terms: -21 + 4m = 21 + 2m Solving -21 + 4m = 21 + 2m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-2m' to each side of the equation. -21 + 4m + -2m = 21 + 2m + -2m Combine like terms: 4m + -2m = 2m -21 + 2m = 21 + 2m + -2m Combine like terms: 2m + -2m = 0 -21 + 2m = 21 + 0 -21 + 2m = 21 Add '21' to each side of the equation. -21 + 21 + 2m = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 2m = 21 + 21 2m = 21 + 21 Combine like terms: 21 + 21 = 42 2m = 42 Divide each side by '2'. m = 21 Simplifying m = 21
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