Answer:
I could be mistaken but I believe that x= 42.5
Step-by-step explanation:
To find this, you solve for 4x+10=180. 
This is because the total angle measure of line RD should be 180 degrees.
When you solve this equation, you get 42.5 for X
 
        
             
        
        
        
Answer:
x=3
Step-by-step explanation:
29-3x=5x+5
29=5x+5+3x
29=8x+5
29-5=8x
24÷8=x
3=x
 
        
             
        
        
        
No, You only reverse the inequality symbol when you divide by a negative number.