Answer:
I know this
Step-by-step explanation:
but I dont :) goodluck tho
 
        
             
        
        
        
Hope it a right answer for you
 
        
                    
             
        
        
        
Treat this as an ordinary linear equation. Try to isolate x, as some value. Also remember the basic rules of inequalities: If you're dividing, or multiplying, by a negative, you flip the inequality.
        
                    
             
        
        
        
Answer:
CD = 45
Step-by-step explanation:
CE = 180
( x + 6 ) + ( 4x - 21 ) = 180
5x - 15 = 180
5x = 195
x = 39
substitute x in CD 
CD = x + 6
CD = 39 + 6
CD = 45