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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