$\left(2\right)\left(-3\right)-\left(4\right)\left(-2\right)$
$16m^2-1$
$3y^2;\:y=2$
$-3\left(-7\:-\:6b\right)$
$2x^2-14x-9$
$-8x-32y-8$
$-5-\:\left(-1\right)$
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