3+10x[181x2-2-5x(24+24:a)] = 623 => 10x[181x2-2-5x(24+24:a)] = 623-3 => 10x[181x2-2-5x(24+24:a)] = 620=> 181x2-2-5x(24+24:a) = 620 / 10 => 181x2-2-5x(24+24:a) = 62 => 362-2-5x(24+24:a) = 62 => 360-5x(24+24:a) = 62 => 5x(24+24:a) = 360-62 => 5x(24+24:a)=298 => 24+24:a=298/5 => 24/a = 298/5-24 => 24/a = 298/5 - 120/5 => 24/a = (298-120)/5 => 24/a = 178/5 => a=24*5/178 => a=120/178 => a=60/89
