[tex] =\tt \frac{3}{7} m - 3 + 4n + \frac{2}{7} m - 2n + 6[/tex]
[tex] =\tt \frac{3}{7} m + \frac{2}{7} m + 4n - 2n + 6 - 3[/tex]
[tex]\color{plum} =\tt \frac{5}{7}m + 2n + 3 [/tex]
○=> Therefore,
[tex] \color{hotpink}\tt \frac{3}{7} m - 3 + 4n + \frac{2}{7} m - 2n + 6 \color{plum}= \frac{5}{7} m + 2n + 3[/tex]
