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D( x )
(x^2)/55 = 0
(x^2)/55 = 0
(x^2)/55 = 0
1/55*x^2 = 0 // : 1/55
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x/11)/((x^2)/55) = 0
5*x^-1 = 0 // : 5
x^-1 = 0
x należy do O
x belongs to the empty set
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