Question

[676/13/(31*20-31-a)]*45-23*91=247 aflati a

Answer 1

[52:(31*20-31-a)]*45-23*91=247

[52:(620-31-a0]*45-2093=247

[52:(589-a)]*45=247+2093

am luat ca necunoscuta (589-a) si am notat-o cu x

52:x*45=2340

52:x=2340:45

52:x=52

x=52:52

x=1

x=589-a

1=589-a

a=589-1

a=588