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Simplifying -9 = u + -1 Reorder the terms: -9 = -1 + u Solving -9 = -1 + 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 = -1 + u + -1u Combine like terms: u + -1u = 0 -9 + -1u = -1 + 0 -9 + -1u = -1 Add '9' to each side of the equation. -9 + 9 + -1u = -1 + 9 Combine like terms: -9 + 9 = 0 0 + -1u = -1 + 9 -1u = -1 + 9 Combine like terms: -1 + 9 = 8 -1u = 8 Divide each side by '-1'. u = -8 Simplifying u = -8
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