Answer:
If you want me to find out how you got it, please dm me.
brainly.com/question/12500028
Step-by-step explanation:
a= 3
b=3
c=3
d=3
12-?=4, or it could also be like 12-3=4. so thats how i got it.
hope it helps. i tried. hope i did it correct if thats what u need
