Răspuns :
2378+1957=4353
4563+a=7802
a=7802-4563
a=3449
v:2378+3449+1975=7802
2458+1738=4196
a-4196=3507
a=3507+4196
a=7703
V:7703-2458-1738=3507
8971+3759=12730
12730-a=7001
a=12730-7001
a=5729
V: 8971-5729+3759=7001
+++cel mai bun raspuns
4563+a=7802
a=7802-4563
a=3449
v:2378+3449+1975=7802
2458+1738=4196
a-4196=3507
a=3507+4196
a=7703
V:7703-2458-1738=3507
8971+3759=12730
12730-a=7001
a=12730-7001
a=5729
V: 8971-5729+3759=7001
+++cel mai bun raspuns