6/7 и 18/21
6/7 и 6/7
6/7=6/7
-3/5 и 27/-45
-3/5 и 3/-5
-3/5=3/-5
2/3 и 2а/3а
2/3 и 2/3
2/3=2/3
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6/7 и 18/21
6/7 и 6/7
6/7=6/7
-3/5 и 27/-45
-3/5 и 3/-5
-3/5=3/-5
2/3 и 2а/3а
2/3 и 2/3
2/3=2/3