0
Anonymous
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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depends what 'a' =
a + a + a - 2a = 3a - 2a = a
2a+5a+9a = 16a
A=2
a = 1