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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/4 = 11/x // - 11/x
6/4-(11/x) = 0
6/4-11*x^-1 = 0
-11*x^-1 = -3/2 // : -11
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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