$11xy-x^2z+23x^2z$
$\frac{d^2}{dx^2}\left(-\frac{1}{\left(x-1\right)^2}\right)$
$x+6=3x+22$
$\left(3x^4+\frac{7}{2}\right)\left(3x^4-\frac{3}{5}\right)$
$8-999$
$\int\frac{\left(6x-3\right)}{x^2-x-30}dx$
$4x^2-4y^2$
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