Question 696973
6+{5-[2+(3-1)]}=
= 6 + [5 - {2 + 2)]   {subtracted 3 - 1}
= 6 + (5 - 4)   {added 2 + 2}
= 6 + 1   {subtracted 5 - 4}
= 7   {added}
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