Put the numbers 1 to 9 in the nine boxes by using each digit once. Using a letter to represent a digit in each box, the puzzle is ab * c = de + fg = hi.
0:00 problem
0:50 starting
2:27 10s
9:03 answer
9:33 10s more
14:08 20s
17:06 30s
20:03 40s
22:00 summary
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