5x-3=2.5x+x solve this equation that I just gave you for X then plug it in to 2.5x and that will equal MN 
 
        
             
        
        
        
Answer:
Step-by-step explanation:

 
        
             
        
        
        
Answer:
x = 15
Step-by-step explanation:
x + 2x - 2 + 2x - 2 = 71
Solve for x, you get 15. 
 
        
             
        
        
        
The answer would be C sorry if it’s wrong