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18-(2*(1/26)*x) = 9-((1/26)*x) // - 9-((1/26)*x)
(1/26)*x-(2*(1/26)*x)-9+18 = 0
(-1/13)*x+(1/26)*x-9+18 = 0
9-1/26*x = 0 // - 9
-1/26*x = -9 // : -1/26
x = -9/(-1/26)
x = 234
x = 234
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