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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(22/9)/x = 16/13 // - 16/13
(22/9)/x-(16/13) = 0
(22/9)/x-16/13 = 0
22/9*x^-1 = 16/13 // : 22/9
x^-1 = 72/143
-1 < 0
1/(x^1) = 72/143 // * x^1
1 = 72/143*x^1 // : 72/143
143/72 = x^1
x = 143/72
x = 143/72
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