(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
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
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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