Răspuns :
a+250=800-b=196+c=d-17=500
a+250=500
a=500-250
a=250
800-b=500
b=800-500
b=300
196+c=500
c=500-196
c=304
d-17=500
d=500+17
d=517
d=500+17=517 c=517-196=321 b=800-196=604 a=800-250=550 verificare:!550+250=800-604=196+321=517-17=500