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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/11 = 132/x // - 132/x
6/11-(132/x) = 0
6/11-132*x^-1 = 0
-132*x^-1 = -6/11 // : -132
x^-1 = 1/242
-1 < 0
1/(x^1) = 1/242 // * x^1
1 = 1/242*x^1 // : 1/242
242 = x^1
x = 242
x = 242
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