9=4a-a

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Solution for 9=4a-a equation: 



9=4a-a

We move all terms to the left:

9-(4a-a)=0

We add all the numbers together, and all the variables

-(+3a)+9=0

We get rid of parentheses

-3a+9=0

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

-3a=-9

a=-9/-3

a=+3

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