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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8000 = 1/x // - 1/x
8000-(1/x) = 0
8000-x^-1 = 0
-1*x^-1 = -8000 // : -1
x^-1 = 8000
-1 < 0
1/(x^1) = 8000 // * x^1
1 = 8000*x^1 // : 8000
1/8000 = x^1
x = 1/8000
x = 1/8000
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