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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
34/6 = 9/x // - 9/x
34/6-(9/x) = 0
34/6-9*x^-1 = 0
-9*x^-1 = -17/3 // : -9
x^-1 = 17/27
-1 < 0
1/(x^1) = 17/27 // * x^1
1 = 17/27*x^1 // : 17/27
27/17 = x^1
x = 27/17
x = 27/17
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