(a+3 4/7)-1 2/7=4 3/7 2 19/23-(5/23+b)=1 6/23 (c-2 3/11)+5 1/11=7 3 4/9 +(8-d)=6 5/9

(а+3 4/7)-1 2/7=4 3/7 а+3 4/7=4 3/7+1 2/7 а+3 4/7=5 5/7 а=5 5/7-3 4/7 а=2 1/7 2 19/23-(5/23+b)=1 6/23 5/23+b=2 19/23-1 6/23 5/23+b=1 13/23 b=1 13/23-5/23 b=1 8/23 (c-2 3/11)+5 1/11=7 c-2 3/11=7-5 1/11 c-2 3/11=6 11/11-5 1/11 c-2 3/11=1 10/11 c=1 10/11+2 3/11 c=3 13/11 c=2 2/11 3 4/9+(8-d)=6 5/9 8-d=6 5/9-3 4/9 8-d=3 1/9 d=8-3 1/9 d=7 9/9-3 1/9 d=4 8/9