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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 5/11 // - 5/11
7/x-(5/11) = 0
7/x-5/11 = 0
7*x^-1 = 5/11 // : 7
x^-1 = 5/77
-1 < 0
1/(x^1) = 5/77 // * x^1
1 = 5/77*x^1 // : 5/77
77/5 = x^1
x = 77/5
x = 77/5
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