First, you have to find the common denominator.
It is 40.
But if we change the denominator, you have to change the numerator as well.
We multiplied 10 by 4 to get to 40, so we multiply 7 by 4.

We multiplied 8 by 5 to get to 40, so we do the same to 6:

Now add them:

We get:
58/40
1+18/40 is my answer...