$7x=8y\sqrt{x^2+1}\left(\frac{dy}{dx}\right)$
$-32-3.2$
$14+200$
$2a^2b-\frac{3}{2}a^2b$
$\left(b-6\right)\left(b+5\right)$
$\left(4b-1\right)\left(4b+1\right)$
$x+1x-2$
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