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x in (-oo:+oo)
9*c = (5*(a-b))/c-160 // - (5*(a-b))/c-160
9*c-((5*(a-b))/c)+160 = 0
9*c-5*c^-1*(a-b)+160 = 0
9*c-5*c^-1*(a-b)+160 = 0
5*b*c^-1-5*a*c^-1+9*c+160 = 0
5*b*c^-1-5*a*c^-1+9*c+160 = 0
x belongs to the empty set
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