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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x-2 = 4/x+1 // - 4/x+1
8/x-(4/x)-2-1 = 0
8/x-4*x^-1-2-1 = 0
4*x^-1 = 3 // : 4
x^-1 = 3/4
-1 < 0
1/(x^1) = 3/4 // * x^1
1 = 3/4*x^1 // : 3/4
4/3 = x^1
x = 4/3
x = 4/3
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