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