$\log_{x+7}\left(2x^2-x-5\right)=2$
$7+4^2$
$3+5x+98-2x$
$\int\frac{6x-9}{x^2-1}dx$
$\left(\frac{x}{2}-1\right)\left(\frac{x}{2}-3\right)$
$0.6+5+3.078+6.832$
$-13^0$
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