a)(-6)+[-6+(-3+2)] B)12-(9-6+7)
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A_![-6+[-6+(-1)]
-6+[-6-1]
-6+[-7]
-6-7
-13](https://tex.z-dn.net/?f=+-6%2B%5B-6%2B%28-1%29%5D%0A%0A-6%2B%5B-6-1%5D%0A%0A-6%2B%5B-7%5D%0A%0A-6-7%0A%0A-13 "-6+[-6+(-1)]
-6+[-6-1]
-6+[-7]
-6-7
-13")
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