Simple....
4y-y+11=18
You know you want to find y so just isolate the variable....
4y-y+11=38
Add the y's..
3y+11=38
Now, subtract 11 to isolate y...
3y+11=38
-11 -11
3y=27
Now...divide...
[tex] \frac{3y}{3} = \frac{27}{3} [/tex]
y=9
Thus, your answer.