What is the value of the following expression. 2×{6+[12÷(3+1)]}-1

I got 83. I got it by doing 3+1 first because it was the FIRST parenthesis. Then I did 12 divided by 4 then that equaled 3 and since the 3 would still be in parenthesis you times that by 12 and get 36. You then do 36 + 6 which is 42. 42 x 2 = 84. Lastly 84 - 1 = 83 I hoped this helped and I'm sorry if I was a little bit confusing!