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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 12/17 // - 12/17
3/x-(12/17) = 0
3/x-12/17 = 0
3*x^-1 = 12/17 // : 3
x^-1 = 4/17
-1 < 0
1/(x^1) = 4/17 // * x^1
1 = 4/17*x^1 // : 4/17
17/4 = x^1
x = 17/4
x = 17/4
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