$\log_{12}\left(2-5x\right)=\log_{12}\left(-4x+7\right)$

$\frac{d}{dx}16e^y=x^4+y^5$

$\lim_{x\to x-2}\left(x^2-3x+1\right)$

$\left(3a\right)\cdot\left(8b\right)$

$\frac{x+1}{3}-\frac{x-1}{5}=\frac{2}{15}$

$\lim_{t\to\infty}2\sqrt{t}e^{\sqrt{t}}$