Answer :
[tex]\frac{M}{4}+6=3\ \ \ \ \ | subtract\ 6\\\\
\frac{M}{4}=-3\ \ \ \ \ | multiply\ by\ 4\\\\
M=-12\\\\Solution\ is\ M=-12.[/tex]
I assume you got to figure out what m equals so m/4+6=3 then multiply by 4+6 to cancel fraction m= 3(4+6) which m = 12+ 18 = 30