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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-(4/x)+4+4 = (2*x)/(x^2)-16 // - (2*x)/(x^2)-16
5/x-(4/x)-((2*x)/(x^2))+4+4+16 = 0
5/x-4*x^-1-2*x^-1+4+4+16 = 0
-1*x^-1 = -24 // : -1
x^-1 = 24
-1 < 0
1/(x^1) = 24 // * x^1
1 = 24*x^1 // : 24
1/24 = x^1
x = 1/24
x = 1/24
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