$3 y = 0$
$7,5-9$
$\lim_{x\to3}\frac{x^2-2x-3}{x-3}$
$-2.6-5.-2$
$5d^2-2bc-3d$
$\left(s+2t\right)\left(s-2t\right)$
$\left(2x\:2\:3x\:1\:2\right):\left(2x\:2\:1\right)$
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