$3x-4<2x+5$
$x^22y-z^2+x^2yz^2=20$
$x^2-5x^2+6x$
$x^4+2x^2-8$
$\left(63\right)-\left(-72\right)$
$\frac{\left(8x-4\right)}{x^2+2x}$
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