$x^2y^3+2;\:x=1;\:y=-5$
$x+5<5x-7$
$\frac{64-n^3}{4+n}$
$4+1-9-10+6$
$\frac{6x^3}{3+2x^2}$
$n6-72n+81n^4$
$\sqrt[6]{a^6}\cdot\sqrt[3]{a^3}$
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