all you need is in the photo please answer fast

r = 3n + 2m
where
r = 6840
n = 1740
m = ?
[tex]\begin{gathered} 6840=3(1740)+2m \\ 6840=5220+2m \\ 6840-5220=5220+2m-5220 \\ 1620=2m \\ \frac{1620}{2}=\frac{2m}{2} \\ m=810 \end{gathered}[/tex]answer m = 810