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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 = 30 -6u = 30 Divide each side by '-6'. u = -5 Simplifying u = -5
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