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