Answer :
First you need to find a common denominator.
3/7 & 5/6 will be multiplied by each others denominators .
18/42 & 35/42
8 18/42
- 7 35/42
= 25/42
3/7 & 5/6 will be multiplied by each others denominators .
18/42 & 35/42
8 18/42
- 7 35/42
= 25/42