[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
[tex] - 12 - 7m = 4(4m + 6) - 5m \\ - 12 - 7 m \: = 16m + 24 + 5m \\ - 12 + 24 = 16m + 5m + 7m \\12 = 28m \\ m = \frac{28}{12} \\ \\ m = \frac{7}{3} [/tex]