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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/x = 0.25 // - 0.25
100/x-0.25 = 0
100*x^-1 = 0.25 // : 100
x^-1 = 0.0025
-1 < 0
1/(x^1) = 0.0025 // * x^1
1 = 0.0025*x^1 // : 0.0025
400 = x^1
x = 400
x = 400
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