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Simplifying 5u + -9 = 9 + 7u + -4u Reorder the terms: -9 + 5u = 9 + 7u + -4u Combine like terms: 7u + -4u = 3u -9 + 5u = 9 + 3u Solving -9 + 5u = 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 + 5u + -3u = 9 + 3u + -3u Combine like terms: 5u + -3u = 2u -9 + 2u = 9 + 3u + -3u Combine like terms: 3u + -3u = 0 -9 + 2u = 9 + 0 -9 + 2u = 9 Add '9' to each side of the equation. -9 + 9 + 2u = 9 + 9 Combine like terms: -9 + 9 = 0 0 + 2u = 9 + 9 2u = 9 + 9 Combine like terms: 9 + 9 = 18 2u = 18 Divide each side by '2'. u = 9 Simplifying u = 9
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