1ebec223e0dc2bae61abe9e74683756c99728fdf50826f165a12f8db3428f67ed3421f61c53757aa65c9968de8b29c

따라서~이므로 까진 알겠는데 왜

a가 왜 -2고 b고 2a가 되는거지?

- dc official App