9a-99=81

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Solution for 9a-99=81 equation: 



9a-99=81

We move all terms to the left:

9a-99-(81)=0

We add all the numbers together, and all the variables

9a-180=0

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

9a=180

a=180/9

a=20

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