$\frac{12xy}{3x^2}\\:x\\:\\:4y\\::\\:\frac{3y^2}{x}$
$8y+4$
$\sqrt{16a^4}-\sqrt[3]{64b^{12}}$
$\left(x+12\right)\left(x-13\right)$
$4x+x^2=2z^3-4z$
$e^xy\frac{dy}{dx}-e^{-2x-y}=e^{-y}$
$\left(2a+3\right)\left(a^3-2a^2+3a-1\right)$
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