I need to turn that into an equation but I cant figure it out.

Answer:
Hello!!! Princess Sakura here ^^
Step-by-step explanation:
The equation will be...
[tex]\frac{3x-6}{2} +12[/tex]
I don't know if you need to solve it but here you go anyways...
[tex]\frac{3}{2}x+9[/tex]