$81z^2+108zw+36w^2$
$\lim_{x\to\infty}\left(\frac{5}{x^2-42}\right)$
$-3.2-\left(-6.9\right)$
$-29\cdot\left(-64\right)$
$2\left(6k-1\right)=-38$
$-18:6-35\left(-7\right)+\left(-11\right)$
$7x\:+\:28\:\cdot\:5$
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