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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-5 = 9/2 // - 9/2
3/x-(9/2)-5 = 0
3/x-9/2-5 = 0
3*x^-1 = 19/2 // : 3
x^-1 = 19/6
-1 < 0
1/(x^1) = 19/6 // * x^1
1 = 19/6*x^1 // : 19/6
6/19 = x^1
x = 6/19
x = 6/19
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