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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.57 = 0.575/x // - 0.575/x
2.57-(0.575/x) = 0
2.57-0.575*x^-1 = 0
-0.575*x^-1 = -2.57 // : -0.575
x^-1 = 4.46956522
-1 < 0
1/(x^1) = 4.46956522 // * x^1
1 = 4.46956522*x^1 // : 4.46956522
0.22373541 = x^1
x = 0.22373541
x = 0.22373541
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