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Simplifying 9 = (u + 7) + -5u Reorder the terms: 9 = (7 + u) + -5u Remove parenthesis around (7 + u) 9 = 7 + u + -5u Combine like terms: u + -5u = -4u 9 = 7 + -4u Solving 9 = 7 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. 9 + 4u = 7 + -4u + 4u Combine like terms: -4u + 4u = 0 9 + 4u = 7 + 0 9 + 4u = 7 Add '-9' to each side of the equation. 9 + -9 + 4u = 7 + -9 Combine like terms: 9 + -9 = 0 0 + 4u = 7 + -9 4u = 7 + -9 Combine like terms: 7 + -9 = -2 4u = -2 Divide each side by '4'. u = -0.5 Simplifying u = -0.5
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