98:x+9=23 60•(y:40+4)=720 39-(15z+48):27=35
98:х=23+9, х=98:32, х=3,0625у:40 = у:40+4=720/60, у:40=8, у=320 15z+48=(39-35)*27? 15z=108-48. z=60/15, z=15