$81=3^y$
$-4-12-\left[\left(-13-20+8\right)-4\right]$
$\frac{m^2n+mn^2}{\sqrt[3]{m^2}-\sqrt[3]{n^2}}$
$4x^4-50x^3+104x^2-40x$
$x^411x^2y^2+y^4$
$x-4>-1$
$\sqrt{3}x+6=6$
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