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(7*x)/a-((4*x)/c) = b // - b
(7*x)/a-b-((4*x)/c) = 0
(7*x)/a-b-4*c^-1*x = 0
-b-4*c^-1*x = 0 // + b
-4*c^-1*x = b // : -4*c^-1
x = b/(-4*c^-1)
x = b/(-4*c^-1)
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