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Simplifying -3(u + -1) = 9u + -21 Reorder the terms: -3(-1 + u) = 9u + -21 (-1 * -3 + u * -3) = 9u + -21 (3 + -3u) = 9u + -21 Reorder the terms: 3 + -3u = -21 + 9u Solving 3 + -3u = -21 + 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. 3 + -3u + -9u = -21 + 9u + -9u Combine like terms: -3u + -9u = -12u 3 + -12u = -21 + 9u + -9u Combine like terms: 9u + -9u = 0 3 + -12u = -21 + 0 3 + -12u = -21 Add '-3' to each side of the equation. 3 + -3 + -12u = -21 + -3 Combine like terms: 3 + -3 = 0 0 + -12u = -21 + -3 -12u = -21 + -3 Combine like terms: -21 + -3 = -24 -12u = -24 Divide each side by '-12'. u = 2 Simplifying u = 2
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