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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/6 = 11/x // - 11/x
7/6-(11/x) = 0
7/6-11*x^-1 = 0
-11*x^-1 = -7/6 // : -11
x^-1 = 7/66
-1 < 0
1/(x^1) = 7/66 // * x^1
1 = 7/66*x^1 // : 7/66
66/7 = x^1
x = 66/7
x = 66/7
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