$5a-2a+9$
$\lim_{x\to-\infty}\left(\frac{x}{1+x^2}\right)$
$15c^2-d^2+60c^2-d$
$2x^3-6-11x$
$\int\left(x^5\right)\frac{1}{\sqrt{4x^2+25}}dx$
$\frac{3x^2-3x}{2x^3-2x}$
$72\cdot\frac{1}{3}\cdot2$
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