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= 2+{-[-(15)+(7)]-2}-[5-(-3)-(-1)-(4)-(3)]-[(6)-(4)]
=2+{-[-8]-2}-[5+3+1-4-3]-[2]
=2+{8-2}-[2]-[2] = 2+{6}-4 = 2+6-4 = 4