2a-9=12-a

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Solution for 2a-9=12-a equation: 



2a-9=12-a

We move all terms to the left:

2a-9-(12-a)=0

We add all the numbers together, and all the variables

2a-(-1a+12)-9=0

We get rid of parentheses

2a+1a-12-9=0

We add all the numbers together, and all the variables

3a-21=0

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

3a=21

a=21/3

a=7

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