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Simplifying 9 = 3(u + 7) + -6u Reorder the terms: 9 = 3(7 + u) + -6u 9 = (7 * 3 + u * 3) + -6u 9 = (21 + 3u) + -6u Combine like terms: 3u + -6u = -3u 9 = 21 + -3u Solving 9 = 21 + -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. 9 + 3u = 21 + -3u + 3u Combine like terms: -3u + 3u = 0 9 + 3u = 21 + 0 9 + 3u = 21 Add '-9' to each side of the equation. 9 + -9 + 3u = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 3u = 21 + -9 3u = 21 + -9 Combine like terms: 21 + -9 = 12 3u = 12 Divide each side by '3'. u = 4 Simplifying u = 4
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