The Mystery Writer's Stratagem

The Mystery Writer's Stratagem (, Misuteri Sakka Kara no Chōsenjō, Lit. "The Mystery Writer's Written Challenge") is the 8th side case in Judgment. 
==Plot==
Takayuki Yagami meets the owner of a publishing house called Cloudy Sky Publishing at Café Mijore to discuss the case. He says that a famous author is about to give the publishing rights to his latest work to one of the publishers at a conference, but that being a mystery writer, there will be some kind of puzzle to solve to get the rights. The publisher is so desperate for the rights that he offers to pay Yagami handsomely to help him solve the puzzle.
At the conference, the MC tells the audience that the draft for the new book is locked in a safe next to him, and that whoever unlocks the safe with the right combination will win the publishing rights. The participants are then all given a piece of paper with a puzzle that, when solved, will give the combination.
This is a basic algebra puzzle. It can be deduced from the given "equations" at the top that A=1, B=2, C=0, and D=1. By substituting this information into the four puzzle equations underneath, this results in the answer 4134. When Yagami enters this combination, the safe unlocks, winning the publishing rights for his client.
==Gallery==
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Category:Judgment Side Cases