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Simplifying 20 = 13 + -2u Solving 20 = 13 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. 20 + 2u = 13 + -2u + 2u Combine like terms: -2u + 2u = 0 20 + 2u = 13 + 0 20 + 2u = 13 Add '-20' to each side of the equation. 20 + -20 + 2u = 13 + -20 Combine like terms: 20 + -20 = 0 0 + 2u = 13 + -20 2u = 13 + -20 Combine like terms: 13 + -20 = -7 2u = -7 Divide each side by '2'. u = -3.5 Simplifying u = -3.5
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