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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/(-x) = 2 // - 2
3/(-x)-2 = 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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