$\:-18\:+\:36\:-\:45\::\:3$
$y^2-y-2$
$\frac{x^4+8x^3+12x^2-3x+20}{x+3}$
$12.319-2715$
$-x-1x-1$
$\frac{4}{x}+\frac{8}{x+2}=4$
$\lim_{x\to\infty}\left(\frac{2x-1}{2x+5}\right)^{\left(\frac{2x+1}{3}\right)}$
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