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Simplifying 81 + -1u = 8u Solving 81 + -1u = 8u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-8u' to each side of the equation. 81 + -1u + -8u = 8u + -8u Combine like terms: -1u + -8u = -9u 81 + -9u = 8u + -8u Combine like terms: 8u + -8u = 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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