17/20-х=14/20-3/20
х=17/20-14/20+3/20
х=6/20
х=3/10
8/15-7/15+у=14/15
у=14/15-8/15+7/15
у=13/15
44-4+(4-4)=40
((4*4*4)-4):4=15
44*4-4*4=160