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