Answer :
6x-20
because you do....2 times 3x.....wich equals 6x......
next you take 2 times 10 wich equals.....20......
so it is 6x-20
because you do....2 times 3x.....wich equals 6x......
next you take 2 times 10 wich equals.....20......
so it is 6x-20