C. 6
Step-by-step explanation:
We can tell that TV and TU are going to be equal to each other so all we have to do is set them equal.
[tex]3x-12=5x-24[/tex]
Subtract 3x from both sides.
[tex]-12=2x-24[/tex]
Add 24 to both sides.
[tex]12=2x[/tex]
Divide 12 by 2.
x = 6
