Question 42407
all that you can do on this one if this is all of the problem is combine like terms. 

7x - 2 + 3x - 9  --> rewrite first with all addition. Remember that subtracting a positive is the same as adding a negative. 

7x + (- 2) + 3x + ( - 9)

Rearrange with like terms together

(7x + 3x) + (( -2) + (-9))        
 10x + -11                  Combine the likes terms
10x - 11                    Rewrite in simplest form. adding a negative is 
                            the same as subtracting a       
                               positive.