a+99=9+7a

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Solution for a+99=9+7a equation: 



a+99=9+7a

We move all terms to the left:

a+99-(9+7a)=0

We add all the numbers together, and all the variables

a-(7a+9)+99=0

We get rid of parentheses

a-7a-9+99=0

We add all the numbers together, and all the variables

-6a+90=0

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

-6a=-90

a=-90/-6

a=+15

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