Answer:
16
Step-by-step explanation:
The angle shown there is an example of a vertical angle. An opposite angle formed by intercecting lines. They are always congruent, so to solve this, you must set them equal to eachother. you can gather the equation 4x-5=59. From there, you just solve it like you would any two step equation.
 
        
             
        
        
        
Multiply both the numerator and denominator by  , which is called the "conjugate" of
, which is called the "conjugate" of  :
:

Why do we pick this number? Recall the difference of squares factorization:

Now replace  and
 and  . Then
. Then

So in your fraction, you end up with

Finally, just expand the product.
