Eagles: 29 million AC/DC: 22 million
Work Step by Step
Let e = sales for the Eagles’ album in millions Let a = sales for AC/DC’s album in millions e = a + 7 a + e = 51 a + (a + 7) = 51 2a + 7 = 51 2a = 44 a = 22 e = a + 7 = (22) + 7 = 29
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