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