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Simplifying 18 = -6u + 2(u + 7) Reorder the terms: 18 = -6u + 2(7 + u) 18 = -6u + (7 * 2 + u * 2) 18 = -6u + (14 + 2u) Reorder the terms: 18 = 14 + -6u + 2u Combine like terms: -6u + 2u = -4u 18 = 14 + -4u Solving 18 = 14 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. 18 + 4u = 14 + -4u + 4u Combine like terms: -4u + 4u = 0 18 + 4u = 14 + 0 18 + 4u = 14 Add '-18' to each side of the equation. 18 + -18 + 4u = 14 + -18 Combine like terms: 18 + -18 = 0 0 + 4u = 14 + -18 4u = 14 + -18 Combine like terms: 14 + -18 = -4 4u = -4 Divide each side by '4'. u = -1 Simplifying u = -1
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