16*(11-X/8)=64
16*(11-X/8)=64, 11-x/8=64/16, x/8=11-4, x=7*8, x=56
16*(11-X/8)=64 11-x/8=64:16 11-x/8=4 -x/8=-11+4 -x/8=-7 x/8=7 x=7*8 x=56