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Advent calendar 2018

21 December

Put the digits 1 to 9 (using each digit exactly once) in the boxes so that the sums are correct. The sums should be read left to right and top to bottom ignoring the usual order of operations. For example, 4+3×2 is 14, not 10. Today's number is the smallest number you can make using the digits in the red boxes.
+÷= 2
× + -
×-= 31
+ + -
-×= 42
=
37
=
13
=
-2

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