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Anonymous Anonymous
  • 01-02-2016
  • Mathematics
Answered

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

Verified Answer :

Anonymous Anonymous
  • 01-02-2016

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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