<PRE><B>Question 812652</B>
a + k = 7
a = 7 - k
12a + 9k = 72
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12a + 9k = 72
12(7 - k) + 9k = 72
84 - 3k = 72
84 - 3k = 72
3k = 12
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k = 4
a = 3
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