$-x^2-7x-231$
$x+\frac{13}{4}=-\frac{7}{4}$
$\sqrt { \frac { \pi } { x } }$
$\left(3g+2\right)+\left(2g+8\right)$
$u^{-8}\cdot u^4$
$\frac{y}{e^y}y'=\frac{1}{x^2}$
$l\lim_{t\to0}\left(\frac{\tan\left(t\right)\sec\left(2t\right)}{3t}\right)$
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