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Find the missing number, $x$, in the following matrix $$\begin{matrix} 16 & 13 & 9\\ 11 & 8 & 6\\ 9 & 7 & x \end{matrix}$$

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    $\begingroup$ hi there, welcome to puzzling! however, unattributed puzzles may get closed. please provide the source as soon as possible. thanks! $\endgroup$ – Omega Krypton Jun 7 '19 at 11:13
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    $\begingroup$ (Why are we assuming this is not OP's self-created content? We should assume content is original unless there's pretty good indications it isn't — such as actually finding it elsewhere, in which case posting a link to the other source would be appropriate. I don't see any of that here; did I miss something?) $\endgroup$ – Rubio Jun 10 '19 at 2:24
  • $\begingroup$ Well, in this case a helpful user has pointed out in a flag that this same question appears on brainly.in where it seems to have been posted a few months ago. $\endgroup$ – Gareth McCaughan Jun 27 '19 at 22:34
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I believe the answer is

4, as the numbers in each row decrease from left to right, and alternate between being a power of a number and not being a power of a number.

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    $\begingroup$ How do I hide my answer under a spoiler box? $\endgroup$ – Danne Jun 7 '19 at 17:58
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    $\begingroup$ Please see edit — the syntax is >! (both characters). Hope this helps! $\endgroup$ – El-Guest Jun 7 '19 at 18:16

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