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Simplifying 7 + -1u = u + -9 Reorder the terms: 7 + -1u = -9 + u Solving 7 + -1u = -9 + 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. 7 + -1u + -1u = -9 + u + -1u Combine like terms: -1u + -1u = -2u 7 + -2u = -9 + u + -1u Combine like terms: u + -1u = 0 7 + -2u = -9 + 0 7 + -2u = -9 Add '-7' to each side of the equation. 7 + -7 + -2u = -9 + -7 Combine like terms: 7 + -7 = 0 0 + -2u = -9 + -7 -2u = -9 + -7 Combine like terms: -9 + -7 = -16 -2u = -16 Divide each side by '-2'. u = 8 Simplifying u = 8
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