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Simplifying -31 = 3u + 9 + -80 Reorder the terms: -31 = 9 + -80 + 3u Combine like terms: 9 + -80 = -71 -31 = -71 + 3u Solving -31 = -71 + 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. -31 + -3u = -71 + 3u + -3u Combine like terms: 3u + -3u = 0 -31 + -3u = -71 + 0 -31 + -3u = -71 Add '31' to each side of the equation. -31 + 31 + -3u = -71 + 31 Combine like terms: -31 + 31 = 0 0 + -3u = -71 + 31 -3u = -71 + 31 Combine like terms: -71 + 31 = -40 -3u = -40 Divide each side by '-3'. u = 13.33333333 Simplifying u = 13.33333333
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