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Simplifying -18 = 3(u + 6) + -7u Reorder the terms: -18 = 3(6 + u) + -7u -18 = (6 * 3 + u * 3) + -7u -18 = (18 + 3u) + -7u Combine like terms: 3u + -7u = -4u -18 = 18 + -4u Solving -18 = 18 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. -18 + 4u = 18 + -4u + 4u Combine like terms: -4u + 4u = 0 -18 + 4u = 18 + 0 -18 + 4u = 18 Add '18' to each side of the equation. -18 + 18 + 4u = 18 + 18 Combine like terms: -18 + 18 = 0 0 + 4u = 18 + 18 4u = 18 + 18 Combine like terms: 18 + 18 = 36 4u = 36 Divide each side by '4'. u = 9 Simplifying u = 9
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