$-2+-3^2-3\left(-3-2\right)$
$\frac{2x}{x^2+1}=0$
$-56x-35x^2$
$5x^3-7x^2+9x-5x-x^2+10x^3$
$a^2+3a^2+8a^2$
$\lim_{x\to5}\left(\frac{\sqrt{x+4}-3}{x+5}\right)$
$x^2-6x+7=0$
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