$25y^2-16x^2$
$-\frac{24x^5y^3}{6x^{-3}y^5}$
$\frac{dy}{dx}\left(x^2+4xy+y^2=4\right)$
$\left(x+2\right)\cdot\left(x+3\right)-\left(x-1\right)^2$
$x^2-18x+80=0$
$\frac{x^3y^4}{x^2y}$
$5c^2-39c+25=c^2+2c-75$
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