$a^{-1}bc^7\cdot ab^{-3}c^3\cdot a^0bc^0$
$\left(2z^3+7\right)\left(2z^3-9\right)$
$\frac{5-x^4+x^2-2}{x^2+1}$
$x+13=-37$
$\lim_{x\to5}\left(\left(x-5\right)\cdot\frac{e^{-x}}{x^3-20x^2+125x-250}\right)$
$2x^2+2x-3>0$
$6x^2=-72-48x$
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