$9t\:+\:3\:=\:93$
$6+-3\cdot\left(4-7\right)$
$\lim_{x\to0}\left(\frac{\cot\left(x\right)+1}{\ln\left(x\right)}\right)$
$\lim_{x\to2}\left(\frac{x^3-8}{\sqrt{2}-\sqrt{x}}\right)$
$-3yz-4y+10z-5zy+9y$
$\frac{4x-3}{x^4+2x^3+3x^2}$
$x^2-10x-20$
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