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Simplifying 18 = -7u + 5(u + 5) Reorder the terms: 18 = -7u + 5(5 + u) 18 = -7u + (5 * 5 + u * 5) 18 = -7u + (25 + 5u) Reorder the terms: 18 = 25 + -7u + 5u Combine like terms: -7u + 5u = -2u 18 = 25 + -2u Solving 18 = 25 + -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. 18 + 2u = 25 + -2u + 2u Combine like terms: -2u + 2u = 0 18 + 2u = 25 + 0 18 + 2u = 25 Add '-18' to each side of the equation. 18 + -18 + 2u = 25 + -18 Combine like terms: 18 + -18 = 0 0 + 2u = 25 + -18 2u = 25 + -18 Combine like terms: 25 + -18 = 7 2u = 7 Divide each side by '2'. u = 3.5 Simplifying u = 3.5
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