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Simplifying 21 = u + 6 Reorder the terms: 21 = 6 + u Solving 21 = 6 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. 21 + -1u = 6 + u + -1u Combine like terms: u + -1u = 0 21 + -1u = 6 + 0 21 + -1u = 6 Add '-21' to each side of the equation. 21 + -21 + -1u = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -1u = 6 + -21 -1u = 6 + -21 Combine like terms: 6 + -21 = -15 -1u = -15 Divide each side by '-1'. u = 15 Simplifying u = 15
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