83-[29-{67÷3-(6-9÷3)÷3}]
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56
a)83-[29-{6÷3-(6-9÷3)÷3}]
83-[29-{6÷3-(6-3)÷3}]
83-[29-{6÷3-(3)÷3}]
83-[29-{3-3÷3}]
83-[29-{3-1}]
83-29-2
56
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