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