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D( x )
5*b = 0
16*a = 0
5*b = 0
5*b = 0
5*b = 0
x należy do R
16*a = 0
16*a = 0
16*a = 0
x należy do R
x belongs to the empty set
((4*a)/(5*b))*((15*b)/(16*a)) = 0
x belongs to the empty set
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