nx5=635
n=635:5
n=127
.......................................
892:n=223
n=892:223
n=4
.........................................
n-56:7=127+99
n-8=226
n=226-8
n=218
......................................
865:m=107
m=865:107
m=8 rest 9
......................................
m:12=104 rest 5
m=12x104+5
m=1248+5
m=1253
.................................................
.m+246-7x7=306
m+246-49=306
m+246=306+49
m+246=355
m=355-246
m=109