$1a+3a-4\left(9-a\right)$
$1-\left(-2\right)^2$
$\sqrt{5}+\sqrt{5}$
$\int\left(e^{6x}\right)dx$
$\left(6^85^{-17}\right)\left(6^{-7}5^{19}\right)$
$-28\left(1\right)^2\left(2\right)^3$
$\left(\frac{x}{5}-0.5y^6\right)^2$
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