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Rezolvati in Z ecuatia:
5-|X-4|=2


Răspuns :

5-Ix-4I=2
Ix-4I=5-2
Ix-4I=3
cazul I 
x-4=3
x=3+4
x=7
cazul II:
x-4=-3
x=4-3
x=1
S={1,7}∈Z