2a-9=(a+3)-3a

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Solution for 2a-9=(a+3)-3a equation: 



2a-9=(a+3)-3a

We move all terms to the left:

2a-9-((a+3)-3a)=0



We calculate terms in parentheses: -((a+3)-3a), so:

(a+3)-3a

We add all the numbers together, and all the variables

-3a+(a+3)

We get rid of parentheses

-3a+a+3

We add all the numbers together, and all the variables

-2a+3

Back to the equation:

-(-2a+3)



We get rid of parentheses

2a+2a-3-9=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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