Answer:
Y=3
Explanation:
You would want to multiply y and 4 by 3.
5y+6=3(y+4)
 ×3 ×3
5y+6=3y+12
Now you want to have y by itself. You can first subtract 6 for starters. 
5y+6=3y+12
 -6 -6
5y=3y+6
5y=3y+6
-3y -3y
2y=6
Now you would want to divide.
2y=6
÷2 ÷2
y=3
You're answer would be y=3.