Masatoshi is my best friend.

Masaki is my best friend.

He is working hard to establish a new administration.

Masatsugu is my best friend.

The imperial government was the center of ancient Japanese politics.

Yoshimasa is my best friend.

The concept of 'Bansei' is important in the ancient history of Japan.

He strongly advocated for the separation of politics and religion.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

What should I do to find the root number of this equation?