$2x-5x-9x$
$\left(121x^2-36y^2\right)\left(11x+6y\right)$
$\left(\:x^2\:+\:3\:\right)\:^2$
$3v^2-4^2$
$- 2 x ^ { 3 } \psi ^ { 3 } + x \varphi$
$x^3-9x^2$
$\sqrt[3]{63.999}$
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