$2x^3+6x^2-2x-6$
$3x^4+48x^2$
$\left(2\sqrt{y-3}\right)\left(2\sqrt{y+3}\right)$
$3.9a+5-1.9a+7$
$2x-1=3$
$\left(x+3\right)\left(x^2+3x+9\right)$
$-6^{\infty}$
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