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Simplifying 281 = 21 + -1u Solving 281 = 21 + -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. 281 + u = 21 + -1u + u Combine like terms: -1u + u = 0 281 + u = 21 + 0 281 + u = 21 Add '-281' to each side of the equation. 281 + -281 + u = 21 + -281 Combine like terms: 281 + -281 = 0 0 + u = 21 + -281 u = 21 + -281 Combine like terms: 21 + -281 = -260 u = -260 Simplifying u = -260
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