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Simplifying 7u + 15 = 20 + 5u Reorder the terms: 15 + 7u = 20 + 5u Solving 15 + 7u = 20 + 5u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-5u' to each side of the equation. 15 + 7u + -5u = 20 + 5u + -5u Combine like terms: 7u + -5u = 2u 15 + 2u = 20 + 5u + -5u Combine like terms: 5u + -5u = 0 15 + 2u = 20 + 0 15 + 2u = 20 Add '-15' to each side of the equation. 15 + -15 + 2u = 20 + -15 Combine like terms: 15 + -15 = 0 0 + 2u = 20 + -15 2u = 20 + -15 Combine like terms: 20 + -15 = 5 2u = 5 Divide each side by '2'. u = 2.5 Simplifying u = 2.5
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