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Simplifying u + 13 + u + 5 = u + 45 Reorder the terms: 13 + 5 + u + u = u + 45 Combine like terms: 13 + 5 = 18 18 + u + u = u + 45 Combine like terms: u + u = 2u 18 + 2u = u + 45 Reorder the terms: 18 + 2u = 45 + u Solving 18 + 2u = 45 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. 18 + 2u + -1u = 45 + u + -1u Combine like terms: 2u + -1u = 1u 18 + 1u = 45 + u + -1u Combine like terms: u + -1u = 0 18 + 1u = 45 + 0 18 + 1u = 45 Add '-18' to each side of the equation. 18 + -18 + 1u = 45 + -18 Combine like terms: 18 + -18 = 0 0 + 1u = 45 + -18 1u = 45 + -18 Combine like terms: 45 + -18 = 27 1u = 27 Divide each side by '1'. u = 27 Simplifying u = 27
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