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Simplifying -20 + 13u = 20 + -2 + 15u Combine like terms: 20 + -2 = 18 -20 + 13u = 18 + 15u Solving -20 + 13u = 18 + 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. -20 + 13u + -15u = 18 + 15u + -15u Combine like terms: 13u + -15u = -2u -20 + -2u = 18 + 15u + -15u Combine like terms: 15u + -15u = 0 -20 + -2u = 18 + 0 -20 + -2u = 18 Add '20' to each side of the equation. -20 + 20 + -2u = 18 + 20 Combine like terms: -20 + 20 = 0 0 + -2u = 18 + 20 -2u = 18 + 20 Combine like terms: 18 + 20 = 38 -2u = 38 Divide each side by '-2'. u = -19 Simplifying u = -19
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