He made erron in step 3. He forgot add 4. it should be  
-4m + 4m = -32 - 8n + 4n +4
Greeting
        
                    
             
        
        
        
Answer:
Yes.
Step-by-step explanation:
Although there is not much info on this question, if you were to assume that there are 3 different answers or 3 different methods of solving that problem, it is definitey possible to assume that this is possible.
 
        
             
        
        
        
Answer:
 8.2 
Step-by-step explanation:
let me know if its wrong
 
        
             
        
        
        
Answer:
3
Step-by-step explanation:
50+10=60
20 x 3= 60