20290090050

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20290090050

Post by ada » Thu Mar 08, 2018 4:12 pm

$2x^2-6x-1=0$
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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
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