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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/x = 1/4 // - 1/4
8/x-(1/4) = 0
8/x-1/4 = 0
8*x^-1 = 1/4 // : 8
x^-1 = 1/32
-1 < 0
1/(x^1) = 1/32 // * x^1
1 = 1/32*x^1 // : 1/32
32 = x^1
x = 32
x = 32
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