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Simplifying 15 = 3(u + 3) + -5u Reorder the terms: 15 = 3(3 + u) + -5u 15 = (3 * 3 + u * 3) + -5u 15 = (9 + 3u) + -5u Combine like terms: 3u + -5u = -2u 15 = 9 + -2u Solving 15 = 9 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. 15 + 2u = 9 + -2u + 2u Combine like terms: -2u + 2u = 0 15 + 2u = 9 + 0 15 + 2u = 9 Add '-15' to each side of the equation. 15 + -15 + 2u = 9 + -15 Combine like terms: 15 + -15 = 0 0 + 2u = 9 + -15 2u = 9 + -15 Combine like terms: 9 + -15 = -6 2u = -6 Divide each side by '2'. u = -3 Simplifying u = -3
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