a=10a-99

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Solution for a=10a-99 equation: 



a=10a-99

We move all terms to the left:

a-(10a-99)=0

We get rid of parentheses

a-10a+99=0

We add all the numbers together, and all the variables

-9a+99=0

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

-9a=-99

a=-99/-9

a=+11

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