Answer:
a = 1
Explanation:
2(a+7)-7=9
distribute: 2a + 14 + -7 = 9
combine like terms: 2a + 7 = 9
subtract 7 from both sides: 2a = 2
1
2a+14-7=9
2a+7=9
-7
2a=2/2
a=1
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