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Simplifying 81 = 9(u + 2) Reorder the terms: 81 = 9(2 + u) 81 = (2 * 9 + u * 9) 81 = (18 + 9u) Solving 81 = 18 + 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 = 18 + 9u + -9u Combine like terms: 9u + -9u = 0 81 + -9u = 18 + 0 81 + -9u = 18 Add '-81' to each side of the equation. 81 + -81 + -9u = 18 + -81 Combine like terms: 81 + -81 = 0 0 + -9u = 18 + -81 -9u = 18 + -81 Combine like terms: 18 + -81 = -63 -9u = -63 Divide each side by '-9'. u = 7 Simplifying u = 7
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