Hi I hope u have a great time ...
CD = FE
thus :
[tex]3x + 5 = 7x - 39[/tex]
Add both sides 39
[tex]3x + 5 + 39 = 7x - 39 + 39[/tex]
[tex]3x + 44 = 7x[/tex]
Subtract both sides 3x
[tex]3x - 3x + 44 = 7x - 3x[/tex]
[tex]44 = 4x[/tex]
Switch sides
[tex]4x = 44[/tex]
Divide both sides by 4
[tex] \frac{4x}{4} = \frac{44}{4} \\ [/tex]
[tex]x = 11[/tex]
There u go have a great day ♡
