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x+y+z=4200
x+y=2800
y+z=2500


Răspuns :

x+y+z=4200
x+y=2800
y+z=2500

2800+z=4200
z=4200-2800
z=1400

x+2500=4200
x=4200-2500
x=1700

1700+y=2800
y=2800-1700
y=1100

Verificare : 1700+1100+1400=4200