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Simplifying -1u + -9 = 2u + 9 Reorder the terms: -9 + -1u = 2u + 9 Reorder the terms: -9 + -1u = 9 + 2u Solving -9 + -1u = 9 + 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 + -1u + -2u = 9 + 2u + -2u Combine like terms: -1u + -2u = -3u -9 + -3u = 9 + 2u + -2u Combine like terms: 2u + -2u = 0 -9 + -3u = 9 + 0 -9 + -3u = 9 Add '9' to each side of the equation. -9 + 9 + -3u = 9 + 9 Combine like terms: -9 + 9 = 0 0 + -3u = 9 + 9 -3u = 9 + 9 Combine like terms: 9 + 9 = 18 -3u = 18 Divide each side by '-3'. u = -6 Simplifying u = -6
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