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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/641 = 33/x // - 33/x
11/641-(33/x) = 0
11/641-33*x^-1 = 0
-33*x^-1 = -11/641 // : -33
x^-1 = 1/1923
-1 < 0
1/(x^1) = 1/1923 // * x^1
1 = 1/1923*x^1 // : 1/1923
1923 = x^1
x = 1923
x = 1923
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