Answer: 123
They have to add up to 3 4 5 6 or 7 so it has to be that
        
             
        
        
        
Answer:
5
Step-by-step explanation:
You solve the equation
 
        
                    
             
        
        
        
This would just be 7 1/5 + 3/5 since the negative sign gets distributed and makes (-3/5) into a positive number. 
From there you have basic math and you get 7 4/5.