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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/5 = 2464/x // - 2464/x
4/5-(2464/x) = 0
4/5-2464*x^-1 = 0
-2464*x^-1 = -4/5 // : -2464
x^-1 = 1/3080
-1 < 0
1/(x^1) = 1/3080 // * x^1
1 = 1/3080*x^1 // : 1/3080
3080 = x^1
x = 3080
x = 3080
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