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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100*(25/x) = 5 // - 5
100*(25/x)-5 = 0
2500*x^-1 = 5 // : 2500
x^-1 = 1/500
-1 < 0
1/(x^1) = 1/500 // * x^1
1 = 1/500*x^1 // : 1/500
500 = x^1
x = 500
x = 500
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