$216y^6+729x^3$
$\left(x^3+y^3\right)\left(x^6+x^3y^3+y^6\right)$
$7+5\:.\:4^3$
$\frac{x+1}{x+3}\le2$
$n^4-20n^2+64$
$\frac{2p-3}{2p}$
$-2r^2-40r-2=0$
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