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Simplifying 9 = 7u + -4u Combine like terms: 7u + -4u = 3u 9 = 3u Solving 9 = 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 = 3u + -3u Combine like terms: 3u + -3u = 0 9 + -3u = 0 Add '-9' to each side of the equation. 9 + -9 + -3u = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -3u = 0 + -9 -3u = 0 + -9 Combine like terms: 0 + -9 = -9 -3u = -9 Divide each side by '-3'. u = 3 Simplifying u = 3
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