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Simplifying 18 + 7u + 4(5 + 2u) = 0 18 + 7u + (5 * 4 + 2u * 4) = 0 18 + 7u + (20 + 8u) = 0 Reorder the terms: 18 + 20 + 7u + 8u = 0 Combine like terms: 18 + 20 = 38 38 + 7u + 8u = 0 Combine like terms: 7u + 8u = 15u 38 + 15u = 0 Solving 38 + 15u = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-38' to each side of the equation. 38 + -38 + 15u = 0 + -38 Combine like terms: 38 + -38 = 0 0 + 15u = 0 + -38 15u = 0 + -38 Combine like terms: 0 + -38 = -38 15u = -38 Divide each side by '15'. u = -2.533333333 Simplifying u = -2.533333333
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