Question

{495:[30:(6x4-9xa)]+339:3-124:4}-25x6=31

Answer 1

{495:[30:(24-9a)]+113-31}-150=31. {495:[30:(24-9a)]+82=181. {495:[30:(24-a)=99 notam[30:(24-9a)]cu b. 495:b=99 b=5. Deci 30:(24-9a)=5. Notam( 24-9a )cu c si obtinem 30:c=5 c=30:5=6. Deci 24-9a=6 9a=18. a=2