42-{15-[48-(82-8÷2)]÷2+3}×2=
42-{15-[48-(82-4)]÷2+3}×2=
42-[15-(48-78)÷2+3]×2=
42-(15-(-30)÷2+3)×2=
42-(15-(-15)+3)×2=
42-(0+3)×2=
42-3×2=
42-6=
36
