$\lim_{x\to16}\left(\frac{x+2}{\sqrt{x}-4}\right)$
$y^2-y=x^2-x$
$x^2+4x+14$
$-6ab-5ab-ab$
$9y+3-4x-2y$
$y=ry\left(s-y\right)-qy$
$\frac{81a^4-16b^4}{3a-2b}$
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