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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/3 = 11/x // - 11/x
2/3-(11/x) = 0
2/3-11*x^-1 = 0
-11*x^-1 = -2/3 // : -11
x^-1 = 2/33
-1 < 0
1/(x^1) = 2/33 // * x^1
1 = 2/33*x^1 // : 2/33
33/2 = x^1
x = 33/2
x = 33/2
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