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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/y-((4*x)/x) = 0
(2*x)/y-4 = 0
2*x*y^-1-4 = 0 // + 4
2*x*y^-1 = 4 // : 2*y^-1
x = 4/(2*y^-1)
x = 2*y
x = 2*y
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