5a-9=12-a

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Solution for 5a-9=12-a equation: 



5a-9=12-a

We move all terms to the left:

5a-9-(12-a)=0

We add all the numbers together, and all the variables

5a-(-1a+12)-9=0

We get rid of parentheses

5a+1a-12-9=0

We add all the numbers together, and all the variables

6a-21=0

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

6a=21

a=21/6

a=3+1/2

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