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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-2 = -3/x-8 // + -3/x-8
3/x-(-3/x)-2+8 = 0
3/x+3*x^-1-2+8 = 0
6*x^-1 = -6 // : 6
x^-1 = -1
-1 < 0
1/(x^1) = -1 // * x^1
1 = -1*x^1 // : -1
-1 = x^1
x = -1
x = -1
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