Answer:
It would be 20
Step-by-step explanation:
because 5x+20 = 5x + <u>         </u>
it would have to be 20
to have 1 solution
 
        
             
        
        
        
N-O
———-
O 
(New - old
—————
O) 
8750-12500
——————-
12500
-3750
————
12500
=030%
        
             
        
        
        
A=6 
B= -1/2 
C= 11 
I had this one on my test and I got it right have a good day