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