Answer:
To subtract or add a fraction you must first find a common deniminator between the two.
you can use 10 as a common denomonator in this case.
3 x 2 = 6
5 x 2 = 10
your new fraction to replace 3/5 is 6/10
Now, your equation would be 7/10 - 6/10 = 1/10
Your answer is 1/10