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18-(2*(1/22)*x) = 9-((1/22)*x) // - 9-((1/22)*x)
(1/22)*x-(2*(1/22)*x)-9+18 = 0
(-1/11)*x+(1/22)*x-9+18 = 0
9-1/22*x = 0 // - 9
-1/22*x = -9 // : -1/22
x = -9/(-1/22)
x = 198
x = 198
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