$2\left(4x-1\right)+x$
$\lim_{x\to\infty}\left(\frac{1}{9x+5}\right)$
$r+z+x+z$
$27x-18\le12x+44$
$\left(10.9\right)\cdot\left(-30.6\right)$
$\left(6m+2n-3n\right)-\left(-5m-2n-4\right)$
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