Seudónimo Seudónimo
  • 02-02-2016
  • Mathematics
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Solve 2a + 21 = 8a - 9, step by step

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Аноним Аноним
  • 02-02-2016
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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