PLEASE ANWSER! LOOK AT PICURE!! WHOEVER ANWSER IS CORRECT I WILL MARK BRAINIEST!!!

Answer:
c=-4 OR c=-20
Step-by-step explanation:
See, if D is at -12, and CD is 8, that means that C is 8 away from D, which is -12, I think... so -4, and -20 are both 8 away from D on both sides, I think this is correct, put this answer in...