34s-68=6834s=68+6834s=136s=136/34s=454b-28=2654b=28+2654b=54b=0
34s-68=68 54b-28=26
54b=26+28
54b=54
34s=68+68 b=54/54
34s=136 b=1
s=136/34
s=4