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-(6-3)-[2-(-2)-3] 2+{-[-(15)+(1)]-2}
-(3)-[2+2-3] 2+{-[-15+1]-2}
-3-[1] 2+{-[-14]-2}
-3-1 2+{+14-2}
-4 2+12
14
-3-[2-(-2)-3]
-3-[2+2-3]
-3-1=-4
b)2+{-[-(7+8)+(4-3)]-2}
2+{-[-15+1]-2}
2+{-[-14]-2}
2+{+14-2}
2+12=14
c) -[5-(4-7)-(2-3)]
-[5-(-3)-(-1)]
-[5+3+1]
-9
d)-(7-3)-(5-2)-[(12-6)-9-5)]
-4-3-[6-14]
-7-[-8]
-7+8
1