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Simplifying (6u) + 18 + -1(9u) = -12 Remove parenthesis around (9u) (6u) + 18 + -1 * 9u = -12 Multiply -1 * 9 (6u) + 18 + -9u = -12 Reorder the terms: 18 + (6u) + -9u = -12 Combine like terms: (6u) + -9u = -3u 18 + -3u = -12 Solving 18 + -3u = -12 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + -3u = -12 + -18 Combine like terms: 18 + -18 = 0 0 + -3u = -12 + -18 -3u = -12 + -18 Combine like terms: -12 + -18 = -30 -3u = -30 Divide each side by '-3'. u = 10 Simplifying u = 10
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