Solve for $m$ in $F=G\Big(\dfrac{mM}{r^2}\Big)$
I ended up with $\frac{F}{G}\frac{r^2}{M}=m.$ Can I simplify it further or did I completely mess up the answer? I got to where I was by dividing both sides by $G$ then multiplying it by $r^2$ and the n dividing by $M$.