2{1+[4(2+1)+3]}

2 {1 + [4(2+1) + 3] }

 

Work from the inner-most parenthesees to the outer-most parenthesees.

2 {1 + [4(3) + 3] }

 

And follow the order of operations within each parenthesees. Multiplication comes before addition.

2 {1 + [12 + 3] }

 

2 {1 + [15] }

 

2 {16}

 

32

2{1+[4(3)+3]}

2{1+15}

2{16}

32