$9x+81$
$3\:<8+x$
$-1150+370-1389$
$-2n-\left(9m-10n+m\right)$
$420\cdot2+526+120\cdot3$
$xz\left(xz+8x+z+8\right)\:+\:16x\left(x+1\right)$
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