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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 21/35 // - 21/35
11/x-(21/35) = 0
11/x-3/5 = 0
11*x^-1 = 3/5 // : 11
x^-1 = 3/55
-1 < 0
1/(x^1) = 3/55 // * x^1
1 = 3/55*x^1 // : 3/55
55/3 = x^1
x = 55/3
x = 55/3
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