;   initialize x
      AND  R2, R2, #0   ;   Clear out R2
      ADD  R2, R2, #9   ;   R2 contains the value 9
      STR  R2, R6, #3   ;   x = 9;
                        ;   notice, x has offset 3

      LDR  R2, R6, #3   ;   Get the value of x 
      ADD  R2, R2, #4   ;   calculate x + 4
      STR  R2, R6, #3   ;   x = x + 4;