Step-by-step explanation:
30. i already know this sa. . ....
 
        
             
        
        
        
Susan will need 3 meters of fabric
        
             
        
        
        

so.. the left-hand-side does indeed simplify to x+7, so the equation does check out.
however, notice something, for the equation of x+7, when x = 6, we get (6) + 7 which is 13.
BUT for the rational, we get    

so, even though the siimplification is correct, the rational or original expression is constrained in its domain.
 
        
             
        
        
        
I hope you can read cursive and I hope this helps! (:
 
        
        
        
Answer:
Step-by-step explanation: