3a=12-3a

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Solution for 3a=12-3a equation: 



3a=12-3a

We move all terms to the left:

3a-(12-3a)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a+3a-12=0

We add all the numbers together, and all the variables

6a-12=0

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

6a=12

a=12/6

a=2

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