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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5^1 = 2*x+5/x+5 // - 2*x+5/x+5
5^1-(2*x)-(5/x)-5 = 0
5-2*x-5*x^-1-5 = 0
-2*x^1-5*x^-1 = 0
(-2*x^2-5*x^0)/(x^1) = 0 // * x^2
x^1*(-2*x^2-5*x^0) = 0
x^1
-2*x^2-5 = 0
-2*x^2-5 = 0
DELTA = 0^2-(-5*(-2)*4)
DELTA = -40
DELTA < 0
x in { }
x belongs to the empty set
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