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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
55/x = 211 // - 211
55/x-211 = 0
55*x^-1 = 211 // : 55
x^-1 = 211/55
-1 < 0
1/(x^1) = 211/55 // * x^1
1 = 211/55*x^1 // : 211/55
55/211 = x^1
x = 55/211
x = 55/211
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