$3+2a;a=-5$
$\lim_{x\to2}\left(\frac{7x^3+14x^2}{14x^2-28}\right)$
$0:\left(-520\right):\left(-73\right)$
$\int_k^{-1}\frac{3}{4}\left(1-x^2\right)dx$
$472\cdot56$
$a^2+20-21a$
$81z^2+108zw+36w^2$
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