Answer :
So first you factor it out:
8c - 72 = 12c - 72 - 4c
Then you isolate the c's:
-72 +72 = 12c - 4c -8c
Then you add both sides:
0 = 0c
C is equal to 0
8c - 72 = 12c - 72 - 4c
Then you isolate the c's:
-72 +72 = 12c - 4c -8c
Then you add both sides:
0 = 0c
C is equal to 0
