$\frac{1}{2}\left(10x\:+\:20y\:+10z\right)$
$\left(-900\right)-\left(-1000\right)$
$x^3-2x^2+3x-6$
$3x^2+6x-17=0$
$\frac{x^5}{x^4+x^2+1}$
$11c+8+7c$
$\left(\frac{\tau}{9}+\frac{t}{6}\right)\left(\frac{\tau}{9}-\frac{t}{5}\right)$
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