$-27-11+16+57+15-31$
$5a-\left[-3b-\left(2a+4b-c\right)+4c\right]$
$-12+\left(-4\right)\cdot3$
$\frac{8x^2+16x-6}{2x+3}$
$9x^2-24x-16$
$\lim_{x\to\infty}\left(\frac{\sqrt{x+1}-\sqrt{x-1}}{x}\right)$
$650\cdot.13$
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