XmasMathML

Inspired by @davrous

y = \frac{\log_{e} \frac{x}{m} - s a}{r^{2}}

y r^{2} = \log_{e} \frac{x}{m} - s a

e^{y r^{2}} = \frac{x}{m} - s a

m e^{y r^{2}} = x - m s a

m e^{r r y} = x - m a s