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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = (6/11)/5 // - (6/11)/5
10/x-((6/11)/5) = 0
10/x-6/55 = 0
10*x^-1 = 6/55 // : 10
x^-1 = 3/275
-1 < 0
1/(x^1) = 3/275 // * x^1
1 = 3/275*x^1 // : 3/275
275/3 = x^1
x = 275/3
x = 275/3
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