20170050040

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[phpBB Debug] PHP Warning: in file [ROOT]/vendor/twig/twig/lib/Twig/Extension/Core.php on line 1266: count(): Parameter must be an array or an object that implements Countable
20170050040

Post by ada » Sun Oct 29, 2017 7:39 pm

$3x+y=10$, $x+y=8$

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