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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 28/33 // - 28/33
7/x-(28/33) = 0
7/x-28/33 = 0
7*x^-1 = 28/33 // : 7
x^-1 = 4/33
-1 < 0
1/(x^1) = 4/33 // * x^1
1 = 4/33*x^1 // : 4/33
33/4 = x^1
x = 33/4
x = 33/4
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