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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3 = 3.3/x // - 3.3/x
3-(3.3/x) = 0
3-3.3*x^-1 = 0
-3.3*x^-1 = -3 // : -3.3
x^-1 = 0.90909091
-1 < 0
1/(x^1) = 0.90909091 // * x^1
1 = 0.90909091*x^1 // : 0.90909091
1.1 = x^1
x = 1.1
x = 1.1
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