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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1*(1/2) = 25/x // - 25/x
1*(1/2)-(25/x) = 0
1/2-25*x^-1 = 0
-25*x^-1 = -1/2 // : -25
x^-1 = 1/50
-1 < 0
1/(x^1) = 1/50 // * x^1
1 = 1/50*x^1 // : 1/50
50 = x^1
x = 50
x = 50
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