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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
950/x = 3/5 // - 3/5
950/x-(3/5) = 0
950/x-3/5 = 0
950*x^-1 = 3/5 // : 950
x^-1 = 3/4750
-1 < 0
1/(x^1) = 3/4750 // * x^1
1 = 3/4750*x^1 // : 3/4750
4750/3 = x^1
x = 4750/3
x = 4750/3
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