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D( a )
3*a = 0
3*a = 0
3*a = 0
3*a = 0 // : 3
a = 0
a in (-oo:0) U (0:+oo)
(7/(3*a))/(2/5) = 0
35/6*a^-1 = 0 // : 35/6
a^-1 = 0
a należy do O
a belongs to the empty set
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