$b2-6b+4=0$
$\frac{1}{z^2-2z}$
$y-2y+y$
$\int\frac{x^4}{\left(1-x\right)^8}dx$
$\frac{d}{dx}x+xy-2x^3$
$\frac{3x^2}{-x}$
$\left(\frac{2}{3}x^2-z\right)^3$
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