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Simplifying 6u = 21 + -1u Solving 6u = 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. 6u + u = 21 + -1u + u Combine like terms: 6u + u = 7u 7u = 21 + -1u + u Combine like terms: -1u + u = 0 7u = 21 + 0 7u = 21 Divide each side by '7'. u = 3 Simplifying u = 3
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