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Simplifying 1 + u = 13 + -2u Solving 1 + u = 13 + -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. 1 + u + 2u = 13 + -2u + 2u Combine like terms: u + 2u = 3u 1 + 3u = 13 + -2u + 2u Combine like terms: -2u + 2u = 0 1 + 3u = 13 + 0 1 + 3u = 13 Add '-1' to each side of the equation. 1 + -1 + 3u = 13 + -1 Combine like terms: 1 + -1 = 0 0 + 3u = 13 + -1 3u = 13 + -1 Combine like terms: 13 + -1 = 12 3u = 12 Divide each side by '3'. u = 4 Simplifying u = 4
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