$4\left(6^2\right)-\left(8^2\right)$
$-28-+18+35-16+-42$
$wx+nx+yw+yn$
$\left(-4x-1\right)+\left(5x-3\right)$
$2a\left(m-5\right)-\left(a-2\right)\left(5-m\right)$
$d x + e ^ { x + y } d y = 0$
$\frac{m}{s^2}\cdot\frac{1}{m}$
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