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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/6 = 9/x // - 9/x
7/6-(9/x) = 0
7/6-9*x^-1 = 0
-9*x^-1 = -7/6 // : -9
x^-1 = 7/54
-1 < 0
1/(x^1) = 7/54 // * x^1
1 = 7/54*x^1 // : 7/54
54/7 = x^1
x = 54/7
x = 54/7
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