Solve 2a + 21 = 8a - 9, step by step

1 answer:

6 0

2a + 21 = 8a - 9

Combine like terms.

2a + 21 = 8a - 9
-2a -2a

21 = 6a - 9
+9 +9

30 = 6a
6a/6 = 30/6
a = 5

Answer: a = 5

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