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18-(12*x) = 9-((1/24)*x) // - 9-((1/24)*x)
(1/24)*x-(12*x)-9+18 = 0
(1/24)*x-12*x-9+18 = 0
9-287/24*x = 0 // - 9
-287/24*x = -9 // : -287/24
x = -9/(-287/24)
x = 216/287
x = 216/287
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