$3y+1y$
$dy+2xy^2dx=0$
$\frac{x}{2}+\frac{y}{2}$
$8a^2+12ab-20a$
$21x^2-20x-9=0$
$\left(15x^2y-7xy^2+13y^3\right)-\left(5x^2y-14xy^2+26y^3\right)$
$\frac{\frac{3x}{2y}}{\frac{4y^{-3}}{4x^{-5}}}$
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