$\sqrt{396x^8y^{19}}$
$7-5+9b$
$-6y^4\cdot\frac{1}{\sqrt{u}}\cdot2\sqrt{u}$
$3x^{2}+x-4=0$
$\left(7a+b\right)-\left(-3a-4b\right)$
$\int\frac{x+2}{x^2+11x+18}\:\:dx$
$\left(7k-4e\right)\left(4e+7k\right)$
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