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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/4 = 8/x // - 8/x
6/4-(8/x) = 0
6/4-8*x^-1 = 0
-8*x^-1 = -3/2 // : -8
x^-1 = 3/16
-1 < 0
1/(x^1) = 3/16 // * x^1
1 = 3/16*x^1 // : 3/16
16/3 = x^1
x = 16/3
x = 16/3
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