$\lim_{x\to-1}\left(\frac{x^4+7x^3+3x+9}{x+1}\right)$
$\left(5^{-4}\cdot\frac{5^{-2}}{5^{-4}}\right)^5$
$-6-7+3-5$
$\frac{d^2}{dx^2}\left(\frac{-5}{-9x-3}\right)$
$144-\left(a+b\right)^2$
$7+3\cdot2-\left(-4-3\cdot2\right)$
$\frac{12x^3+13x^2-59x-30}{4x-5}$
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