$8a+6\:\:-\:\:2a+2$
$4\left(x-2\right)+a\left(x-2\right)$
$e^{x^2+2x+1}$
$y=x^2+6x+9$
$\left(7z\right)^2$
$x^2-7x-420$
$-x^{2+6x+10}$
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