Решите уравнение

х+4/21 = 2/3 + 2/7,

у + 1/4 = 4/5 - 3/10,

(4/5 - х) + 13/20 = 7/10,

2/3 - (2/9 + х) = 1/3

X+4/21=2/3+2/7

x+4/21=14/21+6/21

x+4/21=20/21

x=20/21-4/21

x=16/21

y+1/4=4/5-3/10

y+1/4=6/10-3/10

y+1/4=3/10

y=3/10-1/4

y=6/20-5/20

y=1/20

(4/5-x) + 13/20=7/10

4/5-x+13/20=7/10

45-x=7/10-13/20

45-x=1/20

x=45-1/20

x=44,95

2/3 - (2/9+x) = 1/3

2/3-2/9-x=1/3

4/9-x=1/3

x=1/9