hard 9×9 Set 4 Table Grid
120x6=7=19+120x42=2
1=8=83=
2-3=2-4=32+6-1
8=24x4
9/24+1=6-12+2=6=
4=3/810x9=
2=11+64x913+
7=6=3-8=
6=21+72x2-
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536798142
491826537
283564971
812359764
974185326
148237659
325671498
769413285
657942813