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Simplifying 8u + 21 = 11u Reorder the terms: 21 + 8u = 11u Solving 21 + 8u = 11u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-11u' to each side of the equation. 21 + 8u + -11u = 11u + -11u Combine like terms: 8u + -11u = -3u 21 + -3u = 11u + -11u Combine like terms: 11u + -11u = 0 21 + -3u = 0 Add '-21' to each side of the equation. 21 + -21 + -3u = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3u = 0 + -21 -3u = 0 + -21 Combine like terms: 0 + -21 = -21 -3u = -21 Divide each side by '-3'. u = 7 Simplifying u = 7
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