I used my famous guess and check system to find the answer to this problem. I simply solve the problem using different numbers until I find the right number. You begin by taking 5 and multipling it by 2 to get 10, twice a number. Next, you subtract 6 from 10 to get 4, 4 more than the number. Finally you get 5 as an answer, difference between 6 and twice a number. I hope this helped. Good luck and best wishes.