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Anonymous
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
Wiki User
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It is: 9a-a-a = 7a
9a + 1
2a+5a+9a = 16a
7a
a = 6b = 9a + b = 6 + 9 = 15