3a-3=9+a

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



3a-3=9+a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a-a-9-3=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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