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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
625/x = 100 // - 100
625/x-100 = 0
625*x^-1 = 100 // : 625
x^-1 = 4/25
-1 < 0
1/(x^1) = 4/25 // * x^1
1 = 4/25*x^1 // : 4/25
25/4 = x^1
x = 25/4
x = 25/4
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