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