18% equals .18 so what you would do is .18*16.91 take the sum of that then subtract it by 16.91 That's your answer (:
        
                    
             
        
        
        
This is the answer 7x - 22
        
             
        
        
        
Answer:
is the comma supposed to be a decimal point?
Step-by-step explanation:
 
        
                    
             
        
        
        
64/100 is easy its just 64 out of 100
        
             
        
        
        
6.4 - 2x - 6.63x = 610.5
subtract 6.4 from both sides 
-2x -6.63x =604.1
collect like terms 
-8.63x = 604.1
divide both sides by -8.63
x= -70