$15x-9<6x-13$
$\left(x+2y\right)dx-xdy=0$
$7x^2+8x^2-2$
$x+1\le-2$
$\left(m+n-7\right)\left(m+n+7\right)$
$\frac{9\left(x-1\right)}{4}$
$\frac{x^5-x^8}{1+x^2}$
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