3a+9=12a

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Solution for 3a+9=12a equation: 



3a+9=12a

We move all terms to the left:

3a+9-(12a)=0

We add all the numbers together, and all the variables

-9a+9=0

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

-9a=-9

a=-9/-9

a=1

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