9-2a=9-a

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Solution for 9-2a=9-a equation: 



9-2a=9-a

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2a-(-1a+9)+9=0

We get rid of parentheses

-2a+1a-9+9=0

We add all the numbers together, and all the variables

-a=0

a=0/-1

a=0

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