So I’m having difficulties with an equation involving a $\log(x)$. I was actually trying to solve a physics problem, but since this is an issue relating maths I came here.
Anyway, my equation is: $-9 = 102 - 20\log(r) - \frac{r}{500}$
And I have to find the value of $r$. The thing is, I keep getting stuck when trying to solve it. And I’m not even sure I have the right equation to begin with - does mine make sense? Does it work? And if so, how can I find the value of $r$?