Answer:
y = 1
Explanation:
You need to find the a multiple divisible by all numbers, in this case that would be 90
you multiply everything so the denominator is 90
7/18 = 35/90
5/6 = 75/90
4/15 = 24/90
13/45 = 26/90
So 8 35/90 - (1 75/90 + y) = 3 24/90 + 2 26/90
6 50/90 - y = 5 50/90
subtract 6 50/90 from both sides
-y = -1
divide both sides by -1
y = 1