$2\cdot36$
$y^2+6y=5$
$\frac{\frac{1}{l\:}}{\:s+\frac{r}{l}}\cdot\:\frac{1}{s}$
$f2+13f+40$
$\left(x^2-4n^3\right)^2$
$\left(16x+14y\right)^2$
$\:3x\left(n-5\right)+7y\left(n-5\right)\:$
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