(3a-9)=3

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Solution for (3a-9)=3 equation: 



(3a-9)=3

We move all terms to the left:

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

We get rid of parentheses

3a-9-3=0

We add all the numbers together, and all the variables

3a-12=0

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

3a=12

a=12/3

a=4

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