9a-21=2a

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Solution for 9a-21=2a equation: 



9a-21=2a

We move all terms to the left:

9a-21-(2a)=0

We add all the numbers together, and all the variables

7a-21=0

We move all terms containing a to the left, all other terms to the right

7a=21

a=21/7

a=3

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