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Simplifying 21 + 7u = 56 Solving 21 + 7u = 56 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 7u = 56 + -21 Combine like terms: 21 + -21 = 0 0 + 7u = 56 + -21 7u = 56 + -21 Combine like terms: 56 + -21 = 35 7u = 35 Divide each side by '7'. u = 5 Simplifying u = 5
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