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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000 = 104/x // - 104/x
1000-(104/x) = 0
1000-104*x^-1 = 0
-104*x^-1 = -1000 // : -104
x^-1 = 125/13
-1 < 0
1/(x^1) = 125/13 // * x^1
1 = 125/13*x^1 // : 125/13
13/125 = x^1
x = 13/125
x = 13/125
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