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Simplifying -9u + 4 = 8(u + 9) Reorder the terms: 4 + -9u = 8(u + 9) Reorder the terms: 4 + -9u = 8(9 + u) 4 + -9u = (9 * 8 + u * 8) 4 + -9u = (72 + 8u) Solving 4 + -9u = 72 + 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. 4 + -9u + -8u = 72 + 8u + -8u Combine like terms: -9u + -8u = -17u 4 + -17u = 72 + 8u + -8u Combine like terms: 8u + -8u = 0 4 + -17u = 72 + 0 4 + -17u = 72 Add '-4' to each side of the equation. 4 + -4 + -17u = 72 + -4 Combine like terms: 4 + -4 = 0 0 + -17u = 72 + -4 -17u = 72 + -4 Combine like terms: 72 + -4 = 68 -17u = 68 Divide each side by '-17'. u = -4 Simplifying u = -4
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