Ok so I know the answere it is -11
43390/8?
that would be 5,423.75 or 5,423.8
Draw anything and colour the whole thing in.
Add 0.5 to 0.5 and 3.7 to make X by itself
3.7 + 0.5 is 4.2
4.2 / 2 (because you get X by itself
X = 2.1
I believe that answer is 54