Question 180601
Q-[R+S]-T= (7m+3n) - [(11-2m) + (n+5)] - (-m-3n+8)
         =  7m + 3n - (11-2m+n+5) + m + 3n - 8
         =  7m + 3n - 11 + 2m - n - 5 + m + 3n - 8
         =  10m + 5n -24