$x^2+5x+4+x+1$
$9y^2-6yz+z^2$
$24a-16b+3c-8b+7a+5c+23b$
$\left(+35\right)-\left(-77\right)+\left(+5\right)$
$9x^2-16>0$
$\frac{\left(x+2\right)}{2x^2-4x}$
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