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Simplifying 9 = 7(u + 7) + 3u Reorder the terms: 9 = 7(7 + u) + 3u 9 = (7 * 7 + u * 7) + 3u 9 = (49 + 7u) + 3u Combine like terms: 7u + 3u = 10u 9 = 49 + 10u Solving 9 = 49 + 10u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-10u' to each side of the equation. 9 + -10u = 49 + 10u + -10u Combine like terms: 10u + -10u = 0 9 + -10u = 49 + 0 9 + -10u = 49 Add '-9' to each side of the equation. 9 + -9 + -10u = 49 + -9 Combine like terms: 9 + -9 = 0 0 + -10u = 49 + -9 -10u = 49 + -9 Combine like terms: 49 + -9 = 40 -10u = 40 Divide each side by '-10'. u = -4 Simplifying u = -4
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