-(6-3)-[2-(5-7)-3]
2+{-[-(7+8)+(4+3)]-2}
-[5-(4-7)-(2-3)
-(7-3)-(5-2)-[(12-6)-(9-5)]
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2+{-[-(7+8)+(4+3)]-2} -[5-(4-7)-(2-3)-(7-3)-(5-2)-[(12-6)-(9-5)]
= 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
= 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
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