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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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