Question

{[-3+2(8-5)+2]+[6+(-7+1)-5]}+20

Answer 1

= {[-3+2(8-5)+2]+[6+(-7+1)-5]}+20
={[-3+2.3+2}+{6-6-5} + 20
={[-3+6+2] - 5} + 20
= { 5 - 5} + 20
= 20