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Simplifying -12 + -11u + -9 = -13u + 19 Reorder the terms: -12 + -9 + -11u = -13u + 19 Combine like terms: -12 + -9 = -21 -21 + -11u = -13u + 19 Reorder the terms: -21 + -11u = 19 + -13u Solving -21 + -11u = 19 + -13u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '13u' to each side of the equation. -21 + -11u + 13u = 19 + -13u + 13u Combine like terms: -11u + 13u = 2u -21 + 2u = 19 + -13u + 13u Combine like terms: -13u + 13u = 0 -21 + 2u = 19 + 0 -21 + 2u = 19 Add '21' to each side of the equation. -21 + 21 + 2u = 19 + 21 Combine like terms: -21 + 21 = 0 0 + 2u = 19 + 21 2u = 19 + 21 Combine like terms: 19 + 21 = 40 2u = 40 Divide each side by '2'. u = 20 Simplifying u = 20
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