$21x-14$
$\frac{3x^3-x^2-65x-2}{x-5}$
$\frac{2}{x+1}+\frac{2x}{x+4}=2$
$\left(\frac{1}{5}a^3+\frac{3}{7}m^3n\right)^2$
$\frac{dy}{dx}\left(5x+6y=xy\right)$
$1-81y^4$
$\left(19-10\right)\cdot\left(-3\right)$
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