$250-120+60-310$
$-3a=9$
$\left(15m-4n\right)^2$
$\lim_{x\to\frac{\pi}{2}}\left(\frac{\tan\left(x\right)}{\frac{21}{2x-21}}\right)$
$\left(-y-x\right)^2$
$\int\frac{\left(x^3-5x^2-12x-9\right)}{x^2-6x-7}dx$
$48a^2-\:8a$
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