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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12.5/x = 0.01 // - 0.01
12.5/x-0.01 = 0
12.5*x^-1 = 0.01 // : 12.5
x^-1 = 0.0008
-1 < 0
1/(x^1) = 0.0008 // * x^1
1 = 0.0008*x^1 // : 0.0008
1250 = x^1
x = 1250
x = 1250
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