$-x^2+2x+6$
$\left(6x^2y\right)^2$
$x^2+x+9$
$\left(7-2x^4\right)^2$
$m^2+10m+9$
$\left(+700\right)\:-\:\left(130\right)\:-\:\left(-120\right)\:-\:\left(270\right)\:+\:\left(-180\right)$
$\left(\sqrt{3+5}\right)\left(\sqrt{3-5}\right)$
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