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Simplifying 15 = -7u + 5(u + 7) Reorder the terms: 15 = -7u + 5(7 + u) 15 = -7u + (7 * 5 + u * 5) 15 = -7u + (35 + 5u) Reorder the terms: 15 = 35 + -7u + 5u Combine like terms: -7u + 5u = -2u 15 = 35 + -2u Solving 15 = 35 + -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. 15 + 2u = 35 + -2u + 2u Combine like terms: -2u + 2u = 0 15 + 2u = 35 + 0 15 + 2u = 35 Add '-15' to each side of the equation. 15 + -15 + 2u = 35 + -15 Combine like terms: 15 + -15 = 0 0 + 2u = 35 + -15 2u = 35 + -15 Combine like terms: 35 + -15 = 20 2u = 20 Divide each side by '2'. u = 10 Simplifying u = 10
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