$\frac{d}{dx}\left(\ln\left(y\right)+\ln\left(x\right)=2x-y-1\right)$
$20a^3-18a^5+9a^2$
$\left(4x-8\right)^2$
$-12+59-\left[-120-\left(21\right)\cdot7\right]$
$\left(y+x^2\right)\left(2+x^2\right)$
$18-\left(-9\right)$
$\left(-3.55\right)+\left(34.25\right)$
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