Answer:
X can equal 22.5
Explanation:
I've set up the equation below:

With this equation, as any addition equation goes, we assume it to be like this:
A + B = C
so
C - A = B
that means,

The easiest thing to do is to make 2/3 have the same denominator as 8/9, we do this by...

So...

We now know that 5 over x equals 2 over nine. We can determine x by cross multiplying as follows:

So, x is 22.5, making the equation indeed solvable.
Have a nice day, fam. This problem really worked my brain! Spread The Love.