......................?

1. 5x = 8
x = 8 : 5
x = 1,6
2. 3/2 y - 4 = 11
3/2y = 11 + 4
3y = 15
y = 15 : 3
y =5

1. 5x = 8
× = 8/5 = 1,6
2. 3/2y-4 = 11
3/2y = 11+4
3y = 15×2
y = 30/3
y = 10
3. 2/5 (3x-4) = 8
6/5x - 8/5 = 8
6/5x = 8 + 8/5
6/5x = 40 + 8
6/5x = 48
6x = 240
x = 40
4. 2y-3/4 = 1 1/3y+5/6
2y-4/3y = 5/6+3/4
6y-4y = 20+18
2y = 38
y = 19