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