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Simplifying 20 = -7u + 5(u + 8) Reorder the terms: 20 = -7u + 5(8 + u) 20 = -7u + (8 * 5 + u * 5) 20 = -7u + (40 + 5u) Reorder the terms: 20 = 40 + -7u + 5u Combine like terms: -7u + 5u = -2u 20 = 40 + -2u Solving 20 = 40 + -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 = 40 + -2u + 2u Combine like terms: -2u + 2u = 0 20 + 2u = 40 + 0 20 + 2u = 40 Add '-20' to each side of the equation. 20 + -20 + 2u = 40 + -20 Combine like terms: 20 + -20 = 0 0 + 2u = 40 + -20 2u = 40 + -20 Combine like terms: 40 + -20 = 20 2u = 20 Divide each side by '2'. u = 10 Simplifying u = 10
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