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5-{2-[2-3+1]-2-2}-2
5-{2-0-4}-2
5+2-2= 5
b) 2-4-(-2-3)-{2-[-2-(-2+3)]-1}+2
-2+5-{2-[-2-1]-1}+2
3-{2+3-1}+2
3-4+2=1
c) -(3-(-2+4))+(5-2)+((4+4)-2)
-(3-2)+3+(8-2)
-1+3+6=8