20160050060

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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
20160050060

Post by ada » Tue Oct 10, 2017 6:05 pm

$y=2x+6$, $y=5x-9$

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