3-9a=12-3a

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



3-9a=12-3a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

-9a+3a-12+3=0

We add all the numbers together, and all the variables

-6a-9=0

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

-6a=9

a=9/-6

a=-1+1/2

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