Решите а)1 3/7-х=4/7 б)2 17/20+(y-1 5/20)=5 11/20 18

1) 1 3/7 - х = 4/7

-х = 4/7 - 1 3/7

-х = 4/7 - 10/7

-х = -6/7

х = 6/7

2) 2 17/20 + (у - 1 5/20) = 5 11/20

2 17/20 + у - 1 5/20 = 5 11/20

у = 5 11/20 - 2 17/20 + 1 5/20

у = (111/20-57/20) + 1 5/20

у = 27/10 + 1 5/20

у = 2 7/10 + 1 5/20

y = 27/10 + 25/20

y = 54/20 + 25/20

y = 79/20

y = 3 19/20