$4\frac{x^3-3x^2+2x+4}{x-7}$
$\lim_{x\to-\infty}\frac{x^2+\sqrt{x^4+3}}{3x^2+7}$
$\left(y+1\right)dx-xdy=0$
$9x^2-12x+1=0$
$24x^4+16x^3\cdot4x^2$
$2x^2\cdot\:\:x^3\cdot\:3x^5:-6x$
$\lim_{x\to2}\left(\frac{x^2+x-6}{x^2-2}\right)$
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