2 4/7 : (0,5х - 23/35) = 7,5
18/7 : (1/2х - 23/35) = 15/2
1/2х - 23/35 = 18/7 : 15/2
1/2х -23/35 = 36/105
1/2х = 36/105 + 23/35 = (36+69) / 105 = 105/105
1/2х = 1
х = 1 : 1/2
х = 2
(1 2/7у - 1/2) : 2,5 = 5,2
(9/7у - 1/2) : 5/2 = 26/5
9/7у - 1/2 = 26/5 * 5/2
9/7у - 1/2 = 13
9/7у = 13 + 1/2
9/7у = 13 1/2 = 27/2
у = 27/2 : 9/7
у = 21/2 = 10 1/2