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Simplifying -6u + 3(u + 4) = -18 Reorder the terms: -6u + 3(4 + u) = -18 -6u + (4 * 3 + u * 3) = -18 -6u + (12 + 3u) = -18 Reorder the terms: 12 + -6u + 3u = -18 Combine like terms: -6u + 3u = -3u 12 + -3u = -18 Solving 12 + -3u = -18 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3u = -18 + -12 Combine like terms: 12 + -12 = 0 0 + -3u = -18 + -12 -3u = -18 + -12 Combine like terms: -18 + -12 = -30 -3u = -30 Divide each side by '-3'. u = 10 Simplifying u = 10
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