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x in (-oo:+oo)
Y = (4/5)*(y-4) // - (4/5)*(y-4)
Y-((4/5)*(y-4)) = 0
(-4/5)*(y-4)+Y = 0
Y-4/5*(y-4) = 0
Y-4/5*(y-4) = 0
Y-4/5*y+16/5 = 0
Y-4/5*y+16/5 = 0
x belongs to the empty set
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