3(a+3)-3(a-3)=a

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



3(a+3)-3(a-3)=a

We move all terms to the left:

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

We add all the numbers together, and all the variables

-1a+3(a+3)-3(a-3)=0

We multiply parentheses

-1a+3a-3a+9+9=0

We add all the numbers together, and all the variables

-1a+18=0

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

-a=-18

a=-18/-1

a=+18

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