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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x/8-(8/x))/1)/8+1/x = 0
(x/8-8*x^-1)/8+1/x = 0
(1/8*x-8*x^-1)/8+1/x = 0
(x*(1/8*x-8*x^-1))/(8*x)+(1*8)/(8*x) = 0
x*(1/8*x-8*x^-1)+1*8 = 0
1/8*x^2 = 0
(1/8*x^2)/(8*x) = 0
(1/8*x^2)/(8*x) = 0 // * 8*x
(x^2)/8 = 0
1/8*x^2 = 0 // : 1/8
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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