Question 131965
Start with the inside and work your way out:

-3{[(-2-3)-(-1-1)-2]-1}+2
-3{[(-5)-(-2)-2]-1}+2
-3{[(-5)+2-2]-1}+2
-3{[(-5)]-1}+2
-3{-5-1}+2
-3{-6}+2
18+2
20


R^2