Х = 2/3х +1
х-2/3х = 1
1/3х=1
х=1: 1/3
х= 1*3
х=3
х-1/2 = 3/4х
х-3/4х=1/2
1/4х= 1/2
х= 1/2:1/4
х= 2
х-2/3 = 5/6х
х-5/6х=2/3
1/6х=2/3
х= 2/3:1/6
х= 4
1 4/5у = у+4
1 4/5у-у = 4
4/5у=4
у= 4:4/5
у= 5
2/3у-1/3=5/9у
2/3у-5/9у= 1/3
1/9у=1/3
у= 1/3:1/9
у= 3
3/4 у -2/3 = 7/12 у
3/4у-7/12у = 2/3
1/6у = 2/3
у= 2/3 :1/6
у = 4