X+15:3×8=68 y-8×4=27
X+5×8=68 x+40=68 x=68-40 x=28 y-32=27 y=27+32 y=59
X+15:3•8=68 x+5•8=68 x+40=68 x=68-40 x=28 проверка 28+15:3•8=68 68=68 у-8•4=27 у-32=27 у=32+27 у=59 проверка 59-8•4=27 27=27