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Simplifying (u + -9) * 9 = 81 Reorder the terms: (-9 + u) * 9 = 81 Reorder the terms for easier multiplication: 9(-9 + u) = 81 (-9 * 9 + u * 9) = 81 (-81 + 9u) = 81 Solving -81 + 9u = 81 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 9u = 81 + 81 Combine like terms: -81 + 81 = 0 0 + 9u = 81 + 81 9u = 81 + 81 Combine like terms: 81 + 81 = 162 9u = 162 Divide each side by '9'. u = 18 Simplifying u = 18
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