$\frac{x^3+2x+3}{x^3}$
$r^2+r-2$
$10.9+8.5+9.8+1.5+3.5$
$-3-\left(-3\right)$
$49x^6-\frac{9}{25}x^2y^2$
$\lim_{x\to\infty}\:\frac{\left(2x^6-x^4\right)}{2}$
$a^2-a+30$
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