$\frac{d}{dx}\left(y^2-2x-4y+9=0\right)$
$5abc^2-12bca^2$
$\frac{2n-1}{4n.2^n}\left(x-3\right)^n$
$4x-3>1$
$478-1500\cdot1\cdot2^0\cdot\left(-3\right)^0$
$25x^2-18x^3+12x-18x^2+25x$
$\left(x+7\right)\left(x-7\right)-x^2$
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