Answer:
a=d-c/b
Subtract c from both sides 
a=d-c/b 
divide both sides by b
 
        
                    
             
        
        
        
Answer:  The answer is 12.5 ft.
Step-by-step explanation:  Given that there is a rectangle with ratio of its length to breadth 8 : 5. Also, the longer side of the rectangle is 20 feet. We are to find the length of the shorter side.
Let, '8x' and '5x' be the length and breadth of the rectangle respectively. Since length is the longer side, so we have

Therefore, width, length of the shorter side will be

Thus, the length of the shorter side is 12.5 ft.
 
        
                    
             
        
        
        
The answer is 254.35 in square
        
                    
             
        
        
        
2x4 is the answer to 4x-2=38