$27x^3+y^3$
$\left(x^{a-2}+6\right)\left(x^{a-2}-8\right)$
$x^2+3x>-2$
$x^2+x+72>0$
$\frac{19.6}{2}$
$1+\frac{b}{2}-\:3\left(\:a-1\right)$
$x^2-8x+9=0$
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