Question

{2+[ 1 + ( -15-15) -2]}

Answer 1

{2+[1+(-30)-2]}
{2+[1-30-2]}
{2+[-31]}
{2-31}
-29

Answer 2

{2+[1+(-15-15)-2]}
{2+[1-30-2]}
{2+[-29-2]}
{2-31}
-29.