$2x-18=2x-18$
$\frac{9b^2y}{27by}$
$\frac{4z^2}{49}-\frac{36z}{7}+81$
$\frac{dy}{dt}=\frac{1}{t\cdot\:\:y+t+y+1}$
$\lim_{x\to1}\left(\frac{-3}{\sqrt{4x+4}-4}\right)$
$\frac{x^2-9y^2}{3x+9y}$
$-\frac{3}{4}y-7\le-19$
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