1) 48 : (20 - х) = 3
20 - х = 48 : 3
20 - х = 16
х = 20 - 16
х = 4
2) х : (80 : 16) = 4
х : 5 = 4
х = 4 ⋅ 5
х = 20
1) 48 : (20 - х) = 3
20 - х = 48 : 3
20 - х = 16
х = 20 - 16
х = 4
2) х : (80 : 16) = 4
х : 5 = 4
х = 4 ⋅ 5
х = 20
48 = 3(20-x)
48 = 60 - 3x
3x = 12
x = 4
x/(80/16) = 4
x•16/80 = 4
x/5 = 4
x=20