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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 8/6 // - 8/6
3/x-(8/6) = 0
3/x-4/3 = 0
3*x^-1 = 4/3 // : 3
x^-1 = 4/9
-1 < 0
1/(x^1) = 4/9 // * x^1
1 = 4/9*x^1 // : 4/9
9/4 = x^1
x = 9/4
x = 9/4
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