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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25 = 0.03/x // - 0.03/x
25-(0.03/x) = 0
25-0.03*x^-1 = 0
-0.03*x^-1 = -25 // : -0.03
x^-1 = 833.33333333
-1 < 0
1/(x^1) = 833.33333333 // * x^1
1 = 833.33333333*x^1 // : 833.33333333
0.0012 = x^1
x = 0.0012
x = 0.0012
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