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D( x )
3*x = 0
6*a = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
6*a = 0
6*a = 0
6*a = 0
x należy do R
x belongs to the empty set
((9*x)/(6*a))*((8*a^2)/(3*x)) = 0
x belongs to the empty set
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