9a-12=3a+6

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Solution for 9a-12=3a+6 equation: 



9a-12=3a+6

We move all terms to the left:

9a-12-(3a+6)=0

We get rid of parentheses

9a-3a-6-12=0

We add all the numbers together, and all the variables

6a-18=0

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

6a=18

a=18/6

a=3

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