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Simplifying 168 = -7(-6 + -3m) 168 = (-6 * -7 + -3m * -7) 168 = (42 + 21m) Solving 168 = 42 + 21m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-21m' to each side of the equation. 168 + -21m = 42 + 21m + -21m Combine like terms: 21m + -21m = 0 168 + -21m = 42 + 0 168 + -21m = 42 Add '-168' to each side of the equation. 168 + -168 + -21m = 42 + -168 Combine like terms: 168 + -168 = 0 0 + -21m = 42 + -168 -21m = 42 + -168 Combine like terms: 42 + -168 = -126 -21m = -126 Divide each side by '-21'. m = 6 Simplifying m = 6
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