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Simplifying 18 = -6u + 4(u + 2) Reorder the terms: 18 = -6u + 4(2 + u) 18 = -6u + (2 * 4 + u * 4) 18 = -6u + (8 + 4u) Reorder the terms: 18 = 8 + -6u + 4u Combine like terms: -6u + 4u = -2u 18 = 8 + -2u Solving 18 = 8 + -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 = 8 + -2u + 2u Combine like terms: -2u + 2u = 0 18 + 2u = 8 + 0 18 + 2u = 8 Add '-18' to each side of the equation. 18 + -18 + 2u = 8 + -18 Combine like terms: 18 + -18 = 0 0 + 2u = 8 + -18 2u = 8 + -18 Combine like terms: 8 + -18 = -10 2u = -10 Divide each side by '2'. u = -5 Simplifying u = -5
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