$xy=28$
$x^2=45$
$\frac{r+1}{2}\ge1$
$\left(a^2b+ac\right)^3$
$5\:-\:\left(-\:4\right)\:-\:\left(-\:2\:+\:27\right)$
$2a-3b+4a+6b-2a+7a-2b$
$\frac{10.000}{0.00001}$
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