$\left(x^4y^7\right)\left(x^6y^7\right)$
$x+\frac{2}{-5}<2x+3$
$4^2+2n$
$\left(13-2x\right)^2$
$\frac{2m^2+6m+4}{4m^4-12m-16}$
$\left(x^2+3y^2\right)^3$
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