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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
64/x = 2/5 // - 2/5
64/x-(2/5) = 0
64/x-2/5 = 0
64*x^-1 = 2/5 // : 64
x^-1 = 1/160
-1 < 0
1/(x^1) = 1/160 // * x^1
1 = 1/160*x^1 // : 1/160
160 = x^1
x = 160
x = 160
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