a+b=343=>b=343-a
b+c=297=>c=297-b
a+c=360=>c=360-a
a+b+0c=343
0a+b+c=297 <=>2c=297+17=>2c=314=>c=314:2=>c=157
0a-b+c=(360-343)=17
a+b+0c=343 a+0b+0c=343-140=203
0a+b+0c=140 <=> 0a+b+0c=140
a0+0b+c=157 0a+0b+c=157
a=203
b=140
c=157
VERIFICARE:
a+b=343<=>203+140=343
b+c=297<=>140+157=297
a+c=360<=>203+157=360