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Afla numărul necunoscut:
8000-2570-x=1500
3640+1917+y=7872


Răspuns :

8000-2570-X=1500
X=8000-2570-1500
X=3930
8000-2570-3930=1500

3640+1917+y=7872
y=3640+1917
y=5557
y=7872-5557
y=2315
3640+1917+2315=7872