$\left(2x^4+x+x^3-2x^2\right)\left(2x^4+x-x^3-2x^2\right)$
$-5y^2-45y$
$2x+7\le4-x$
$\frac{y}{12}+2=-16$
$\frac{6x^2-29x+38}{2x-7}$
$z-2^3$
$2+3x-7$
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