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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
200/25 = 22000/x // - 22000/x
200/25-(22000/x) = 0
200/25-22000*x^-1 = 0
-22000*x^-1 = -8 // : -22000
x^-1 = 1/2750
-1 < 0
1/(x^1) = 1/2750 // * x^1
1 = 1/2750*x^1 // : 1/2750
2750 = x^1
x = 2750
x = 2750
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