$4x^2=81$
$1-a^3$
$\frac{d}{dx}\left(2x^2+5x+2\right)$
$217-\left(-98\right)$
$\frac{2x-3}{x+5}=\frac{x-1}{x}$
$\left(2a+5b\right)\left(3a+b\right)$
$\left(a^1\right)^2$
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