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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.2/x = 16 // - 16
0.2/x-16 = 0
0.2*x^-1 = 16 // : 0.2
x^-1 = 80
-1 < 0
1/(x^1) = 80 // * x^1
1 = 80*x^1 // : 80
1/80 = x^1
x = 1/80
x = 1/80
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