$\left(7-u\right)\left(7+u\right)$
$-5+8+\left(-3\right)+\left|-7+\left(4-3\right)\right|$
$x^2-x+2>0$
$\frac{x}{\left(x^2-3x-4\right)}$
$2x+35>45$
$4^{-8}\cdot4^5$
$-5-n+1+n$
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