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RE: Brainsteem Quickfire Q6 [Win 2 SBD and 1 SBD]
sum of side = 23
solution: sum of 1-9 = 45
sum of three sides = 45 + sum of corners = sum of side x 3
sum of corners = (sum of side x 3) -45
thus the sum of corners is divisible by 3 , we now can try out with limited possibility
oh I forgot to include the number on each side lol