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Simplifying 2u + -9 = u + -8 Reorder the terms: -9 + 2u = u + -8 Reorder the terms: -9 + 2u = -8 + u Solving -9 + 2u = -8 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. -9 + 2u + -1u = -8 + u + -1u Combine like terms: 2u + -1u = 1u -9 + 1u = -8 + u + -1u Combine like terms: u + -1u = 0 -9 + 1u = -8 + 0 -9 + 1u = -8 Add '9' to each side of the equation. -9 + 9 + 1u = -8 + 9 Combine like terms: -9 + 9 = 0 0 + 1u = -8 + 9 1u = -8 + 9 Combine like terms: -8 + 9 = 1 1u = 1 Divide each side by '1'. u = 1 Simplifying u = 1

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