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Simplifying 15 = 2(u + 6) + -5u Reorder the terms: 15 = 2(6 + u) + -5u 15 = (6 * 2 + u * 2) + -5u 15 = (12 + 2u) + -5u Combine like terms: 2u + -5u = -3u 15 = 12 + -3u Solving 15 = 12 + -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. 15 + 3u = 12 + -3u + 3u Combine like terms: -3u + 3u = 0 15 + 3u = 12 + 0 15 + 3u = 12 Add '-15' to each side of the equation. 15 + -15 + 3u = 12 + -15 Combine like terms: 15 + -15 = 0 0 + 3u = 12 + -15 3u = 12 + -15 Combine like terms: 12 + -15 = -3 3u = -3 Divide each side by '3'. u = -1 Simplifying u = -1
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