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Simplifying 9 = -4 + u Solving 9 = -4 + 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. 9 + -1u = -4 + u + -1u Combine like terms: u + -1u = 0 9 + -1u = -4 + 0 9 + -1u = -4 Add '-9' to each side of the equation. 9 + -9 + -1u = -4 + -9 Combine like terms: 9 + -9 = 0 0 + -1u = -4 + -9 -1u = -4 + -9 Combine like terms: -4 + -9 = -13 -1u = -13 Divide each side by '-1'. u = 13 Simplifying u = 13
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