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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-x+2/x-(2/x)-2+2 = 5/6 // - 5/6
x-x+2/x-(2/x)-(5/6)-2+2 = 0
x-x+2/x-2*x^-1-5/6-2+2 = 0
-5/6 = 0
x belongs to the empty set
x belongs to the empty set
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