(х+ 4 2/7)- 3 6/7=6
х+4 2/7- 3 6/7=6
х=6-4 2/7+3 6/7
х=5 4/7
2)9 5/13-(7 6/13-у)= 2 3/13
9 5/13-7 6/13+у=2 3/13
у=2 3/13-9 5/13+7 6/13
у=4/13
вроде так
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(х+ 4 2/7)- 3 6/7=6
х+4 2/7- 3 6/7=6
х=6-4 2/7+3 6/7
х=5 4/7
2)9 5/13-(7 6/13-у)= 2 3/13
9 5/13-7 6/13+у=2 3/13
у=2 3/13-9 5/13+7 6/13
у=4/13
вроде так