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Bolu : B
5 D + 2 B = 4000 x 2
2 D + 3B = 2700 x 5
10 D + 4 B = 8000
10 D + 15 B = 13.500
-11 B = - 5.500
B = 500
2 D + 3 (500) = 2700
2 D = 2700-1500
D = 600