oblicz 2 3/7+4 3/9-1 12/14
2 3/7+4 3/9-1 12/14=2 3/7+4 1/3-1 6/7=2 9/21+4 7/21-1 7/21=6 16/21-4 7/21=
=2 9/21=2 3/7
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2 3/7+4 3/9-1 12/14=2 3/7+4 1/3-1 6/7=2 9/21+4 7/21-1 7/21=6 16/21-4 7/21=
=2 9/21=2 3/7