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