$20=\ln\left(\frac{a}{177.22}\right)$
$9^{x+8}=81^{x-1}$
$\frac{d}{dx}x^3y^3=3$
$\int_s^{\infty}xe^{-\left(x-s\right)}dx$
$3\sqrt[6]{a}2$
$x_=4y$
$y=\cos\left(3x\right)-\frac{1}{x}$
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