Răspuns :
x+321=y
y+1021=2x
x=321-y
y+1021=2x
x=y-321
y+1021=2(y-321)
y+1021=2y-642
y=1663
x+321=1663 x=1342
y+1021=2x
x=321-y
y+1021=2x
x=y-321
y+1021=2(y-321)
y+1021=2y-642
y=1663
x+321=1663 x=1342