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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/100 = 250/x // - 250/x
15/100-(250/x) = 0
15/100-250*x^-1 = 0
-250*x^-1 = -3/20 // : -250
x^-1 = 3/5000
-1 < 0
1/(x^1) = 3/5000 // * x^1
1 = 3/5000*x^1 // : 3/5000
5000/3 = x^1
x = 5000/3
x = 5000/3
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