[(3031+c)×5+12260]÷100=346

Răspuns :

[(3031+c)×5+12260]=346×100
(3031+c)×5+12260=34600
(3031+c)×5=34600-12260
(3031+c)×5=22340
3031+c=22340:5
3031+c=4468
c=4468-3031
c=1437