A column is going from top to bottom
        
                    
             
        
        
        
Answer:
20
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
x=30/7 or decimal x=4.28571
Step-by-step explanation:
 
        
             
        
        
        
For this case we must simplify the following expression:
We eliminate the parentheses taking into account that:

So:

We add similar terms taking into account that:
Equal signs are added and the same sign is placed.
Different signs are subtracted and the major sign is placed.

Answer:
