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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8500 = 25000/x // - 25000/x
8500-(25000/x) = 0
8500-25000*x^-1 = 0
-25000*x^-1 = -8500 // : -25000
x^-1 = 17/50
-1 < 0
1/(x^1) = 17/50 // * x^1
1 = 17/50*x^1 // : 17/50
50/17 = x^1
x = 50/17
x = 50/17
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