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Simplifying 9 + 3u = 81 + -15u Solving 9 + 3u = 81 + -15u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '15u' to each side of the equation. 9 + 3u + 15u = 81 + -15u + 15u Combine like terms: 3u + 15u = 18u 9 + 18u = 81 + -15u + 15u Combine like terms: -15u + 15u = 0 9 + 18u = 81 + 0 9 + 18u = 81 Add '-9' to each side of the equation. 9 + -9 + 18u = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 18u = 81 + -9 18u = 81 + -9 Combine like terms: 81 + -9 = 72 18u = 72 Divide each side by '18'. u = 4 Simplifying u = 4
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