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Simplifying -20 + u = 4 + -1u Solving -20 + u = 4 + -1u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add 'u' to each side of the equation. -20 + u + u = 4 + -1u + u Combine like terms: u + u = 2u -20 + 2u = 4 + -1u + u Combine like terms: -1u + u = 0 -20 + 2u = 4 + 0 -20 + 2u = 4 Add '20' to each side of the equation. -20 + 20 + 2u = 4 + 20 Combine like terms: -20 + 20 = 0 0 + 2u = 4 + 20 2u = 4 + 20 Combine like terms: 4 + 20 = 24 2u = 24 Divide each side by '2'. u = 12 Simplifying u = 12
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