Answer:
22y
Explanation:
The reason why the answer is 22y is because although there are many variables in this problem that have unknown differences and numbers, there are also numbers in between; such as the numbers 5y plus 10, and the number 7y. I got the answer 22y by adding 5y and 7y, which got me the answer 12y. Even though there is no variable in 10, you can still add the number to 12y, making 12y plus 10, which equals 22y.
I hope this helps :)
-EarthGirl :)