[Hints] Arithmetic fill in the squares

Using all the digits from 1 to 9, fill in the squares to fit the stated totals.

20140920_arithmetic_01

(Credits: I learnt of this problem from Guiseppi Butel on brilliant.org.)

Hint: Start with the column or row with the most extreme result. In this case, that would be the middle row (with a result of 29).

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