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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
11/X+6 = 0
11*X^-1 = -6 // : 11
X^-1 = -6/11
-1 < 0
1/(X^1) = -6/11 // * X^1
1 = -6/11*X^1 // : -6/11
-11/6 = X^1
X = -11/6
X = -11/6
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