In the above puzzle, one number is missing. Use numerical skill to solve the puzzle and find out the missing number.

The missing number is 73
Explanation:
Numbers in the lower rows of polygon=
addition of first digits of the upper polygons appends
difference of second digits of the upper polygons
56=(4+1) append (9-3)
44=(2+2) append (7-3)
73=(4+3) append (5-2)

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