$\lim_{x\to0}\left(\frac{arctan2x}{x}\right)$
$6x^2+15x-9=0$
$24=2x+x^2$
$\left(-19\right)\left(-3\right)$
$-\left(361-\left(-273\right)+562\right)+\left(-138+89\right)$
$120-35$
$20\cdot20\cdot20$
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