$7\left(\sqrt{x^2+4}\right)^2+1$
$\left(-3xy^5\right)^4$
$9-\left(-9\right)-19$
$2020\left(2020\right)$
$\left(-5\right)\cdot\left|\left(-17\right)-\left(-19\right)\right|+12+\left(-1\right)$
$\frac{-x^2+6}{-x^2+4}$
$\log_{10}x=2$
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