Answer:
∣x+a+b∣∣x+2a+3b∣
Step-by-step explanation:
∣x+a+b∣∣x+2a+3b∣ 
 
        
             
        
        
        
Let c represent the original amount that this guy had saved up.
He spent 25% of this amount, or 0.25c, on the printer. 
To progress further, we have to know how much the printer cost.
Supposing that the printer cost $100 (which we do not know as a fact), this would be equal to 0.25c.
Thus, his savings originally amounted to c = $100/0.25 = $400.
        
             
        
        
        
Y is same as the missing angle, the triangle need to equal to 180 so if you add 20 to 60 it equal to 80
use 180 to subtract to 80 you will get the missing x, x=80
        
             
        
        
        
I am probably wrong but with the math I do I got 35