This is how I understood the question 
Hope I helped!
 
        
        
        
Answer:
it would be subtraction
Step-by-step explanation:
Because if you are trying to get you would do 2-2 to get 0 and have x by itself
 
        
                    
             
        
        
        
What’s the equation given ?
        
             
        
        
        
Answer:
243.01.
Step-by-step explanation:
The first term (a) = 324.
The common ratio (r) = -108/324 = -1/3.
So sum of 9 terms is:
S(9) = 324 * (1 - (-1/3)^9) / ( 1 - (-1/3)
= 324 ( 1 - (-0.00005076)) / 4/3
= 324 * 1.00005076 / 1.33333
= 243.012.
 
        
             
        
        
        
Hello from MrBillDoesMath!
Answer:
The equations "are balanced"
Discussion:
Given that 
4 + 4 = 8                 => subtracting k from both sides
4 + 4 - k = 8 -k
so the equation shown IS correct. The answer should be the equations "are balanced"
Thank you,
MrB