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Simplifying 8m + -7 = 21 + m Reorder the terms: -7 + 8m = 21 + m Solving -7 + 8m = 21 + 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. -7 + 8m + -1m = 21 + m + -1m Combine like terms: 8m + -1m = 7m -7 + 7m = 21 + m + -1m Combine like terms: m + -1m = 0 -7 + 7m = 21 + 0 -7 + 7m = 21 Add '7' to each side of the equation. -7 + 7 + 7m = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 7m = 21 + 7 7m = 21 + 7 Combine like terms: 21 + 7 = 28 7m = 28 Divide each side by '7'. m = 4 Simplifying m = 4
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