I didn't really get the which part because we shape it to serveral factors, this is one of them
 
        
        
        
The sum of 2 opposites =0
X+6 would now equal 0
So your answer is 0
        
             
        
        
        
Here is your answer 
Please mark it brainliest
 
        
        
        
Answer:
Pretty sure it would be the last one. 
Not sure if you want me to do the work. All I can say is that it would be<em> very long.</em>