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9 = x-((10/11)*x)-9 // - x-((10/11)*x)-9
(10/11)*x-x+9+9 = 0
18-1/11*x = 0 // - 18
-1/11*x = -18 // : -1/11
x = -18/(-1/11)
x = 198
x = 198
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