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D( a )
((13*a)/5)*a^3 = 0
((13*a)/5)*a^3 = 0
((13*a)/5)*a^3 = 0
13/5*a^4 = 0 // : 13/5
a^4 = 0
a = 0
a in (-oo:0) U (0:+oo)
(17/7)/(((13*a)/5)*a^3) = 0
85/91*a^-4 = 0 // : 85/91
a^-4 = 0
a należy do O
a belongs to the empty set
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