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Simplifying 30 = 3(u + 3) + -6u Reorder the terms: 30 = 3(3 + u) + -6u 30 = (3 * 3 + u * 3) + -6u 30 = (9 + 3u) + -6u Combine like terms: 3u + -6u = -3u 30 = 9 + -3u Solving 30 = 9 + -3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3u' to each side of the equation. 30 + 3u = 9 + -3u + 3u Combine like terms: -3u + 3u = 0 30 + 3u = 9 + 0 30 + 3u = 9 Add '-30' to each side of the equation. 30 + -30 + 3u = 9 + -30 Combine like terms: 30 + -30 = 0 0 + 3u = 9 + -30 3u = 9 + -30 Combine like terms: 9 + -30 = -21 3u = -21 Divide each side by '3'. u = -7 Simplifying u = -7
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