$-\frac{9a^7k}{9a^8}$
$y^2-5y-6$
$11a^2-22a$
$\frac{y}{xz\left(x+y\right)}+\frac{z}{xy\left(y+z\right)}+\frac{x}{yz\left(x+z\right)}$
$1-81x^2\:y^4$
$5xe^{y^5}+2y^4\sqrt{x^2-25}y'\:-3e^{y^5}=0$
$\sqrt{2}\cdot\sqrt{3^2}$
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