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Simplifying 9 = -5u + 3(u + 7) Reorder the terms: 9 = -5u + 3(7 + u) 9 = -5u + (7 * 3 + u * 3) 9 = -5u + (21 + 3u) Reorder the terms: 9 = 21 + -5u + 3u Combine like terms: -5u + 3u = -2u 9 = 21 + -2u Solving 9 = 21 + -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. 9 + 2u = 21 + -2u + 2u Combine like terms: -2u + 2u = 0 9 + 2u = 21 + 0 9 + 2u = 21 Add '-9' to each side of the equation. 9 + -9 + 2u = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 2u = 21 + -9 2u = 21 + -9 Combine like terms: 21 + -9 = 12 2u = 12 Divide each side by '2'. u = 6 Simplifying u = 6
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