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Simplifying -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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