SOLUTION: 4a +7+2a=21-a

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Question 513159: 4a +7+2a=21-a
Answer by umail08(87) About Me  (Show Source):
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4a +7+2a=21-a
6a + 7 = 21 – a
6a + a = 21 – 7
7a = 14
7a/7 = 14/7
a = 2