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Simplifying 5u + -81 = u + -1 Reorder the terms: -81 + 5u = u + -1 Reorder the terms: -81 + 5u = -1 + u Solving -81 + 5u = -1 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. -81 + 5u + -1u = -1 + u + -1u Combine like terms: 5u + -1u = 4u -81 + 4u = -1 + u + -1u Combine like terms: u + -1u = 0 -81 + 4u = -1 + 0 -81 + 4u = -1 Add '81' to each side of the equation. -81 + 81 + 4u = -1 + 81 Combine like terms: -81 + 81 = 0 0 + 4u = -1 + 81 4u = -1 + 81 Combine like terms: -1 + 81 = 80 4u = 80 Divide each side by '4'. u = 20 Simplifying u = 20
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