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(5*x)/b-((9*x)/c) = a // - a
(5*x)/b-a-((9*x)/c) = 0
(5*x)/b-a-9*c^-1*x = 0
-a-9*c^-1*x = 0 // + a
-9*c^-1*x = a // : -9*c^-1
x = a/(-9*c^-1)
x = a/(-9*c^-1)
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