9a+9=5a+21

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Solution for 9a+9=5a+21 equation: 



9a+9=5a+21

We move all terms to the left:

9a+9-(5a+21)=0

We get rid of parentheses

9a-5a-21+9=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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