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Simplifying 18 = 7u + 2u Combine like terms: 7u + 2u = 9u 18 = 9u Solving 18 = 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. 18 + -9u = 9u + -9u Combine like terms: 9u + -9u = 0 18 + -9u = 0 Add '-18' to each side of the equation. 18 + -18 + -9u = 0 + -18 Combine like terms: 18 + -18 = 0 0 + -9u = 0 + -18 -9u = 0 + -18 Combine like terms: 0 + -18 = -18 -9u = -18 Divide each side by '-9'. u = 2 Simplifying u = 2
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