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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x+5 = 4/5 // - 4/5
16/x-(4/5)+5 = 0
16/x-4/5+5 = 0
16*x^-1 = -21/5 // : 16
x^-1 = -21/80
-1 < 0
1/(x^1) = -21/80 // * x^1
1 = -21/80*x^1 // : -21/80
-80/21 = x^1
x = -80/21
x = -80/21
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