$x^{-\frac{7}{3}}w^{\frac{5}{4}}$
$\lim_{x\to5}\frac{x^5-2x-15}{x-5}$
$-209-373$
$\left(\sqrt{5+4a}\right)\left(\sqrt{5+4a}\right)$
$x^3\:-\:14^2\:-\:49x$
$5x^7-15x^6+10x^3-20x^2$
$\left(-15\right)\cdot\left(-1\right)$
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