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x in (-oo:+oo)
x = (4-y)/y // - (4-y)/y
x-((4-y)/y) = 0
(-1*(4-y))/y+x = 0
(-1*(4-y))/y+(x*y)/y = 0
x*y-1*(4-y) = 0
y+x*y-4 = 0
(y+x*y-4)/y = 0
(y+x*y-4)/y = 0 // * y
y+x*y-4 = 0
x*y+y-4 = 0 // - y-4
x*y = -(y-4) // : y
x = (-(y-4))/y
x = (4-y)/y
x = (4-y)/y
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