$x^3y^2-16x^3$
$\frac{9a^{12}b^8c}{3a^{11}b^5c}$
$2x^2-2>0$
$\left(8-6+4\right)+\left(8-4+3\right)$
$-b^2+4b+5$
$x^2+18x+91$
$\frac{5}{z}\ge-1$
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