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Simplifying 12 + -13u = -15u Solving 12 + -13u = -15u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '15u' to each side of the equation. 12 + -13u + 15u = -15u + 15u Combine like terms: -13u + 15u = 2u 12 + 2u = -15u + 15u Combine like terms: -15u + 15u = 0 12 + 2u = 0 Add '-12' to each side of the equation. 12 + -12 + 2u = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 2u = 0 + -12 2u = 0 + -12 Combine like terms: 0 + -12 = -12 2u = -12 Divide each side by '2'. u = -6 Simplifying u = -6
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