2a-9=a+12

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



2a-9=a+12

We move all terms to the left:

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

We get rid of parentheses

2a-a-12-9=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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