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Simplifying 3u + 5 = u + 21 Reorder the terms: 5 + 3u = u + 21 Reorder the terms: 5 + 3u = 21 + u Solving 5 + 3u = 21 + 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. 5 + 3u + -1u = 21 + u + -1u Combine like terms: 3u + -1u = 2u 5 + 2u = 21 + u + -1u Combine like terms: u + -1u = 0 5 + 2u = 21 + 0 5 + 2u = 21 Add '-5' to each side of the equation. 5 + -5 + 2u = 21 + -5 Combine like terms: 5 + -5 = 0 0 + 2u = 21 + -5 2u = 21 + -5 Combine like terms: 21 + -5 = 16 2u = 16 Divide each side by '2'. u = 8 Simplifying u = 8
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