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Simplifying 21 + 6u = 9u Solving 21 + 6u = 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. 21 + 6u + -9u = 9u + -9u Combine like terms: 6u + -9u = -3u 21 + -3u = 9u + -9u Combine like terms: 9u + -9u = 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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