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Simplifying 81 = 3u Solving 81 = 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. 81 + -3u = 3u + -3u Combine like terms: 3u + -3u = 0 81 + -3u = 0 Add '-81' to each side of the equation. 81 + -81 + -3u = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -3u = 0 + -81 -3u = 0 + -81 Combine like terms: 0 + -81 = -81 -3u = -81 Divide each side by '-3'. u = 27 Simplifying u = 27
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