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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-9 = 8/3 // - 8/3
2/x-(8/3)-9 = 0
2/x-8/3-9 = 0
2*x^-1 = 35/3 // : 2
x^-1 = 35/6
-1 < 0
1/(x^1) = 35/6 // * x^1
1 = 35/6*x^1 // : 35/6
6/35 = x^1
x = 6/35
x = 6/35
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