$\left(a^2\cdot8^7\right)^2$
$m\left(9-t\right)-n\left(9-t\right)$
$\left(2-4y\right)\left(2+4y\right)$
$25x^2+4-20x$
$6z^2y-12zy^3$
$4x-7\le11$
$3^2+3+3\left(2\right)$
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