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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 20/33 // - 20/33
4/x-(20/33) = 0
4/x-20/33 = 0
4*x^-1 = 20/33 // : 4
x^-1 = 5/33
-1 < 0
1/(x^1) = 5/33 // * x^1
1 = 5/33*x^1 // : 5/33
33/5 = x^1
x = 33/5
x = 33/5
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