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Simplifying -7u + 9 = -8u Reorder the terms: 9 + -7u = -8u Solving 9 + -7u = -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 + -7u + 8u = -8u + 8u Combine like terms: -7u + 8u = 1u 9 + 1u = -8u + 8u Combine like terms: -8u + 8u = 0 9 + 1u = 0 Add '-9' to each side of the equation. 9 + -9 + 1u = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 1u = 0 + -9 1u = 0 + -9 Combine like terms: 0 + -9 = -9 1u = -9 Divide each side by '1'. u = -9 Simplifying u = -9
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