3 upon 7 minus 1 upon 3
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consider
3/7-1/3
=(9-7)/21=2/21
2/9+5/6
=(12+45)/54
=57/54
2/21 / 57/54
2/21x54/57
=2/21x18/19
=2/7x6/19
=12/133
hope this helps you
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