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Simplifying 81 = u + 8u Combine like terms: u + 8u = 9u 81 = 9u Solving 81 = 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. 81 + -9u = 9u + -9u Combine like terms: 9u + -9u = 0 81 + -9u = 0 Add '-81' to each side of the equation. 81 + -81 + -9u = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -9u = 0 + -81 -9u = 0 + -81 Combine like terms: 0 + -81 = -81 -9u = -81 Divide each side by '-9'. u = 9 Simplifying u = 9
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