since the line contains a midpoint, both sides of the line will be equal each other and exactly one half of the entire line
so basically ed = df
and ed + df = ef
first, we find the value of x
[tex]2(3x + 1) = 4x + 12[/tex]
[tex]6x + 2 = 4x + 12[/tex]
[tex]2x = 10[/tex]
[tex]x = 5[/tex]
plug x back into the equation for ef
[tex]4(5) + 12 = ef[/tex]
[tex]20 + 12 = ef[/tex]
[tex]32 = ef[/tex]
