$13x\:-\:5\:=\:-5\:+\:13x$
$\lim_{x\to\infty}\sqrt{2+x}$
$8x^4-12x^5+20x^3-8x^6$
$9x^3-3x^2+2x-5+x^3-4x^2+5x+8$
$\left(x+5\right)\cdot\left(x-5\right)+3x^2+4x-5$
$x^2+3x-270$
$\lim_{x\to0}\frac{x^2}{\left(\sqrt{x^2+12}\right)-\sqrt{12}}$
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