х: 5 = 10
x=10:5
x=2
у 3 = 15
y=15:3
y=5
х: 2 = 6
x= 6×2
x=12
12: х = 6
x=12:6
у : 3 = 12
y=12×3
y=36
20:х= 5
x=20:5
x=4
