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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x+5 = 5/9 // - 5/9
16/x-(5/9)+5 = 0
16/x-5/9+5 = 0
16*x^-1 = -40/9 // : 16
x^-1 = -5/18
-1 < 0
1/(x^1) = -5/18 // * x^1
1 = -5/18*x^1 // : -5/18
-18/5 = x^1
x = -18/5
x = -18/5
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