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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.8 = 25/x // - 25/x
4.8-(25/x) = 0
4.8-25*x^-1 = 0
-25*x^-1 = -4.8 // : -25
x^-1 = 0.192
-1 < 0
1/(x^1) = 0.192 // * x^1
1 = 0.192*x^1 // : 0.192
5.20833333 = x^1
x = 5.20833333
x = 5.20833333
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