$3\:.\:-8\:-\:4\:.\:-6$
$a\left(1-x\right)^2$
$100+6,6$
$\frac{x^3+2x+3}{x+1}$
$\sqrt[4]{y^3}$
$4m-\left[2m+\left(n-3\right)\right]+\left[-4n-\left(2m+1\right)\right]$
$x^2-4x-9$
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