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Simplifying 4m + -9 = 8m + -21 Reorder the terms: -9 + 4m = 8m + -21 Reorder the terms: -9 + 4m = -21 + 8m Solving -9 + 4m = -21 + 8m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-8m' to each side of the equation. -9 + 4m + -8m = -21 + 8m + -8m Combine like terms: 4m + -8m = -4m -9 + -4m = -21 + 8m + -8m Combine like terms: 8m + -8m = 0 -9 + -4m = -21 + 0 -9 + -4m = -21 Add '9' to each side of the equation. -9 + 9 + -4m = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -4m = -21 + 9 -4m = -21 + 9 Combine like terms: -21 + 9 = -12 -4m = -12 Divide each side by '-4'. m = 3 Simplifying m = 3
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