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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-1 = -2/x-9 // + -2/x-9
2/x-(-2/x)-1+9 = 0
2/x+2*x^-1-1+9 = 0
4*x^-1 = -8 // : 4
x^-1 = -2
-1 < 0
1/(x^1) = -2 // * x^1
1 = -2*x^1 // : -2
-1/2 = x^1
x = -1/2
x = -1/2
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