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