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Determinati multimea A={x ∈ Z  | | 2+x | =5 }

Răspuns :

|2+x|=5
2+x=5
x=3 

2+x=-5
x=-5-2
x=-7

A={3, -7}
2+x=5=>x=3
2+x=-5=>x=-7
=>x∈{3;-7}