$\left(-2\right)^2-6\left(-2\right)+8$
$300-104$
$\sqrt{x^{-2}+x^{-10}+x^{-6}}$
$\left(2x+4y\right)\left(6x-4y\right)$
$x^2-10x+5=-20$
$x^2-2x+20$
$4y-5=3$
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