$\frac{2}{3}x-5=7$
$s^2-s+4$
$w^2+20w+12$
$\lim_{x\to12}\left(2x\right)$
$a^3+\:2a^2b+ab^2$
$\frac{dy}{dx}\left(1+y^x=y\right)$
$\left(8\cdot1+5\cdot\left(-8\right)\right):\left(-4\right)$
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