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x = 4/5 x + (1/5)(5/6) x + 8
x = 4/5 x + (5/30) x + 8
x = 4/5 x + 1/6 x + 8 ....... /* 30
30x = 24x + 5x + 240
30x = 29x + 240
30x - 29x = 240
x = 240 ← Total de aves.