5*n+245=845 54:n+67*5=344
5*n=845-245 54:n+335=344
5*n=600 54:n=344-335
n=600:5 54:n=9
n=120 n=54:9
5*120+245= n=6
=600+245 54:6+67*5=
=845 =9+335
=344
n:3*8=616 894-n:4=833
n:3=616:8 n:4=894-833
n:3=77 n:4=61
n=77*3 n=61*4
n=231 n=244
231:3*8= 894-244*4=
=77*8 =894-61
=616 =833