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Simplifying 9 + 5u = -1 + 7u Solving 9 + 5u = -1 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. 9 + 5u + -7u = -1 + 7u + -7u Combine like terms: 5u + -7u = -2u 9 + -2u = -1 + 7u + -7u Combine like terms: 7u + -7u = 0 9 + -2u = -1 + 0 9 + -2u = -1 Add '-9' to each side of the equation. 9 + -9 + -2u = -1 + -9 Combine like terms: 9 + -9 = 0 0 + -2u = -1 + -9 -2u = -1 + -9 Combine like terms: -1 + -9 = -10 -2u = -10 Divide each side by '-2'. u = 5 Simplifying u = 5
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