I believe the answer would be 9
In decimal form its 0.64 and in fraction form its 16/25 :) (simplified from 64/100)
The solution is the thing they always have in common.
Hope this helps you out
answer 68
9x+13=2x+48
-2x -2x
7x+13=48
-13 -13
7x=35
/7 /7
x=5
y=9(5)+13
y=45+13
y=58