Answer:

Step-by-step explanation:
This is our equation

First off we can distribute the 2.5 and the 4
Now our equation is 
subtract
from both sides

add
to both sides

Divide both sides by 

Cc is being multiplied, but since we don't know the value, the answer is going to be c^2
6+6 is 12
if we combine both, the answer to this problem is 12c^2
D-A-C-B should be the order
i really hope this helps