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Simplifying 39 = 3u + 15 Reorder the terms: 39 = 15 + 3u Solving 39 = 15 + 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. 39 + -3u = 15 + 3u + -3u Combine like terms: 3u + -3u = 0 39 + -3u = 15 + 0 39 + -3u = 15 Add '-39' to each side of the equation. 39 + -39 + -3u = 15 + -39 Combine like terms: 39 + -39 = 0 0 + -3u = 15 + -39 -3u = 15 + -39 Combine like terms: 15 + -39 = -24 -3u = -24 Divide each side by '-3'. u = 8 Simplifying u = 8
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