99=9+3x

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Solution for 99=9+3x equation: 



99=9+3x

We move all terms to the left:

99-(9+3x)=0

We add all the numbers together, and all the variables

-(3x+9)+99=0

We get rid of parentheses

-3x-9+99=0

We add all the numbers together, and all the variables

-3x+90=0

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

-3x=-90

x=-90/-3

x=+30

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