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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 7/5 // - 7/5
11/x-(7/5) = 0
11/x-7/5 = 0
11*x^-1 = 7/5 // : 11
x^-1 = 7/55
-1 < 0
1/(x^1) = 7/55 // * x^1
1 = 7/55*x^1 // : 7/55
55/7 = x^1
x = 55/7
x = 55/7
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