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