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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
41/x = 5/2 // - 5/2
41/x-(5/2) = 0
41/x-5/2 = 0
41*x^-1 = 5/2 // : 41
x^-1 = 5/82
-1 < 0
1/(x^1) = 5/82 // * x^1
1 = 5/82*x^1 // : 5/82
82/5 = x^1
x = 82/5
x = 82/5
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