$9\left(-8\right)\left(1\right)$
$\left[-21+16-\left(-15+3\right)\right]$
$\frac{d}{dx}-\frac{x}{5y}$
$6x-\left(x-5\right)<\left(3-2x\right)\cdot\:5$
$\frac{dy}{dx}\left(sinx+2cos3y=0\right)$
$t^2-81$
$-729-4$
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