3a=12-3

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Solution for 3a=12-3 equation: 



3a=12-3

We move all terms to the left:

3a-(12-3)=0

We add all the numbers together, and all the variables

3a-9=0

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

3a=9

a=9/3

a=3

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