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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 6/11 // - 6/11
4/x-(6/11) = 0
4/x-6/11 = 0
4*x^-1 = 6/11 // : 4
x^-1 = 3/22
-1 < 0
1/(x^1) = 3/22 // * x^1
1 = 3/22*x^1 // : 3/22
22/3 = x^1
x = 22/3
x = 22/3
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