Asum of 7 4/6 plus 4 3/6 as a mixed number

Because the denominators are the same you can just add:

add the whole numbers:
7+4=11

add the numerators:
4+3=7

after doing that you now have:
11 7/6

now make 11 7/6 into a proper mixed number:
11 7/6 --> 12 1/6

the answer is 12 1/6