Respuesta :

2x(6+[12/(3+1)])-1
Let's do it in the order of PEMDAS. So first, parentheses.
2x(6+[12/(3+1)])-1
2x(6+[12/4])-1
2x(6+3)-1
2x(9)-1
Now, multiplication.
18-1
Subtract.
17.