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Simplifying 30 = 2(10 + -1u) 30 = (10 * 2 + -1u * 2) 30 = (20 + -2u) Solving 30 = 20 + -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. 30 + 2u = 20 + -2u + 2u Combine like terms: -2u + 2u = 0 30 + 2u = 20 + 0 30 + 2u = 20 Add '-30' to each side of the equation. 30 + -30 + 2u = 20 + -30 Combine like terms: 30 + -30 = 0 0 + 2u = 20 + -30 2u = 20 + -30 Combine like terms: 20 + -30 = -10 2u = -10 Divide each side by '2'. u = -5 Simplifying u = -5
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