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Simplifying 5u + -9 = 4u Reorder the terms: -9 + 5u = 4u Solving -9 + 5u = 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 + 5u + -4u = 4u + -4u Combine like terms: 5u + -4u = 1u -9 + 1u = 4u + -4u Combine like terms: 4u + -4u = 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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