$257^2$
$-4+1+11$
$x^2+2x-4=0$
$\sqrt[4]{16x^8}$
$\left(2x-3x^3\right)^4$
$x+2y-2z-u=0$
$\lim_{n\to\infty}\left(3^{n+1}4^{-n}\right)$
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