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Simplifying -81 + -9u = -18 Solving -81 + -9u = -18 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 = -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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