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Simplifying 2u + 9 = 8u + 21 Reorder the terms: 9 + 2u = 8u + 21 Reorder the terms: 9 + 2u = 21 + 8u Solving 9 + 2u = 21 + 8u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-8u' to each side of the equation. 9 + 2u + -8u = 21 + 8u + -8u Combine like terms: 2u + -8u = -6u 9 + -6u = 21 + 8u + -8u Combine like terms: 8u + -8u = 0 9 + -6u = 21 + 0 9 + -6u = 21 Add '-9' to each side of the equation. 9 + -9 + -6u = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -6u = 21 + -9 -6u = 21 + -9 Combine like terms: 21 + -9 = 12 -6u = 12 Divide each side by '-6'. u = -2 Simplifying u = -2
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