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Simplifying 6u + -13u + -18 = -81 Reorder the terms: -18 + 6u + -13u = -81 Combine like terms: 6u + -13u = -7u -18 + -7u = -81 Solving -18 + -7u = -81 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -7u = -81 + 18 Combine like terms: -18 + 18 = 0 0 + -7u = -81 + 18 -7u = -81 + 18 Combine like terms: -81 + 18 = -63 -7u = -63 Divide each side by '-7'. u = 9 Simplifying u = 9
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