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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*x*(1/x-1) = 0
8*x*(x^-1-1) = 0
( 8*x )
8*x = 0 // : 8
x = 0
( x^-1-1 )
1*x^-1 = 1 // : 1
x^-1 = 1
-1 < 0
1/(x^1) = 1 // * x^1
1 = 1*x^1 // : 1
1 = x^1
x = 1
x in { 0}
x = 1
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