$\left(2b^2\:-\:g\right)\left(2b^2\:+\:g\right)$
$1x^2-81$
$\sqrt[12]{z^{15}}$
$4y^2+4y-15$
$2\cdot x^2+32\cdot x+126>0$
$38x-84$
$-\:\left(-9\:+\:5\right)\:-\:\left(3\:-\:7\right)\:+\:\left(-3\:+5\right)$
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