$a\cdot\left(-5-b\right)^{-\frac{2}{3}}=\frac{1}{\left(-5\text{-b}\right)^{\frac{2}{3}}}$
$\frac{2}{3x}\le-2$
$\left(5^1\right)^-4\:$
$f\left(x\right)=\left(\frac{2x-1}{5-x}\right)^4$
$\frac{4x^3+5x+2}{x+1}$
$-8.2\le3.17-r$
$x^2+ax$
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