Epic puzzle

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15880 (15) = 4817a (11)
X: 13 (10)
afjrk['0' + X (2)] => aFJrK

A: 6cnmf5 (24)
B: 0 (2)
C: 344 (7)
D: c3h29e (18)
E: 1b0d (14)
F: 20560101212 (7)
G: 71eh0 (19)

A (35)[B (2)] + '.' + C (15) + '/' + D (36)['0' + E (17)] + F (36)['0' + G (31)]