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