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'X Is 5 Squares' printed from https://nrich.maths.org/
Can you arrange five different digits (from 0 to 9) in the cross so that
- the total of the four outside numbers is equal to the middle number, and
- the top two numbers multiplied together are also equal to the middle number, and
- the sum of the three numbers forming a diagonal is equal to the other three numbers forming the other diagonal.