$2x+11+6x$
$2x-1\le2x+4$
$-\left(2y+1\right)$
$\left(4c-8\right)^3\left(4c-8\right)^3\left(4c-8\right)^4$
$4x^2-12x+2$
$9x-4+-11x+9$
$\frac{x-1}{5x^2+4x-9}$
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