$x^2+5yz-z^2;\:x=2;\:y=-1$
$2y^2+2y-1=0$
$\sqrt{2475n^5y^4}$
$\left(-3a^3-2b^2\right)\left(a+b\right)$
$673\cdot9+673$
$\int\left(x^{-4}y\right)dx$
$\left(3a^3-5a\:b^2\:-6a^2\:b^3\right)$
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