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Simplifying 21 = 45 + -1u Solving 21 = 45 + -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. 21 + u = 45 + -1u + u Combine like terms: -1u + u = 0 21 + u = 45 + 0 21 + u = 45 Add '-21' to each side of the equation. 21 + -21 + u = 45 + -21 Combine like terms: 21 + -21 = 0 0 + u = 45 + -21 u = 45 + -21 Combine like terms: 45 + -21 = 24 u = 24 Simplifying u = 24
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