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