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D( x )
2*x-(5*x) = 0
2*x-(5*x) = 0
2*x-(5*x) = 0
2*x-5*x = 0
-3*x = 0 // : -3
x = 0
x in (-oo:0) U (0:+oo)
(2*y-y)/(2*x-(5*x)) = 0
(2*y-y)/(2*x-5*x) = 0
y/(-3*x) = 0
x belongs to the empty set
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