9=3+a

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Solution for 9=3+a equation: 



9=3+a

We move all terms to the left:

9-(3+a)=0

We add all the numbers together, and all the variables

-(a+3)+9=0

We get rid of parentheses

-a-3+9=0

We add all the numbers together, and all the variables

-1a+6=0

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

-a=-6

a=-6/-1

a=+6

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