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