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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)
(2*x)/(x^2)-(1/x)-16-4 = 0
(2*x)/(x^2)-x^-1-16-4 = 0
1*x^-1 = 20 // : 1
x^-1 = 20
-1 < 0
1/(x^1) = 20 // * x^1
1 = 20*x^1 // : 20
1/20 = x^1
x = 1/20
x = 1/20
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