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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 17/9 // - 17/9
4/x-(17/9) = 0
4/x-17/9 = 0
4*x^-1 = 17/9 // : 4
x^-1 = 17/36
-1 < 0
1/(x^1) = 17/36 // * x^1
1 = 17/36*x^1 // : 17/36
36/17 = x^1
x = 36/17
x = 36/17
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