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Simplifying 9 = -4u + 7(u + 3) Reorder the terms: 9 = -4u + 7(3 + u) 9 = -4u + (3 * 7 + u * 7) 9 = -4u + (21 + 7u) Reorder the terms: 9 = 21 + -4u + 7u Combine like terms: -4u + 7u = 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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