If

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

0
6 / 7 = 42 =>2
3 / 9 = 27 => 7
8 / 2 = 16 => 6

Then

4 / 5 = 20 =>0

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