Best Answer

2a + 21 = 8a - 9

Add 9 to each side:

2a + 30 = 8a

Subtract 2a from each side:

30 = 6a

Divide each side by 6:

5 = a

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2010-04-26 06:17:00
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Q: 2a plus 21 equals 8a-9
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