4)
3/8x + 7/12x - 5/6x = 9/32;
9/24x + 14/24x - 20/24x = 9/32
3/24x = 9/32
x = 9/32 * 8
x = 9/4
x = 2 1/4
5)
2 1/3 : x - 1 1/6 = 1 5/9;
2 1/3 : x = 1 5/9 + 1 1/6
2 1/3 : x = 1 10/18 + 1 3/18
2 1/3 : x = 2 13/18
x = 2 1/3 : 2 13/18
x = 7/3 * 18/49
x = 6/7
6)
2 1/3 : (x - 1 1/6) = 1 5/9
x - 1 1/6 = 2 1/3 : 1 5/9
x - 1 1/6 = 7/3 * 9/14
x - 1 1/6 = 3/2
x = 3/2 + 1 1/6
x = 9/6 + 1 1/6
x = 1 10/6 = 2 4/6
x = 2 2/3