9a-9=15a-9

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Solution for 9a-9=15a-9 equation: 



9a-9=15a-9

We move all terms to the left:

9a-9-(15a-9)=0

We get rid of parentheses

9a-15a+9-9=0

We add all the numbers together, and all the variables

-6a=0

a=0/-6

a=0

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