$2x+1\:+\:2x-1\:area$
$4x^2-11x-4\le0$
$xe^{-1}$
$\left(12x^3-10y^5\right)$
$4x-9y-7x+7y$
$2\left(4+7\right)$
$25x^4-\frac{25}{16}x^2$
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