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D( x )
-(5*a)-9 = 0
-(5*a)-9 = 0
-(5*a)-9 = 0
-5*a-9 = 0
-5*a-9 = 0
x należy do R
x belongs to the empty set
(15-(5*a))/(-(5*a)-9) = x
x belongs to the empty set
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