Math Olympiad for Elementary | 2018 | Division E | Contest 3 | MOEMS | 3A

Problem: Emma is filling in the 3 by 3 grid shown
with counting numbers from 1 through 9.
She writes them, one per box, making sure
the sum of the numbers in each row, the
sum of the numbers in each column, and
the sum of the numbers in each diagonal
are the same. The grid shows the numbers she has placed so
far. Which number must go in the box labeled X?

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