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x in (-oo:+oo)
(Y-2)/5 = (y-3)/4 // - (y-3)/4
(Y-2)/5-((y-3)/4) = 0
(Y-2)/5+(-1*(y-3))/4 = 0
(4*(Y-2))/(4*5)+(-1*5*(y-3))/(4*5) = 0
4*(Y-2)-1*5*(y-3) = 0
4*Y-5*y+7 = 0
(4*Y-5*y+7)/(4*5) = 0
(4*Y-5*y+7)/(4*5) = 0 // * 4*5
4*Y-5*y+7 = 0
x belongs to the empty set
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