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D( x )
3-x = 0
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in (-oo:3) U (3:+oo)
2*e^(3/(3-x)) = 0
e^(3/(3-x)) = 0
x należy do O
2*e^(3/(3-x)) = 0 <=> 2 = 0 or 2*e^(3/(3-x)) = 0 <=> e^(3/(3-x)) = 0
x belongs to the empty set
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