9=9+7x

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Solution for 9=9+7x equation: 



9=9+7x

We move all terms to the left:

9-(9+7x)=0

We add all the numbers together, and all the variables

-(7x+9)+9=0

We get rid of parentheses

-7x-9+9=0

We add all the numbers together, and all the variables

-7x=0

x=0/-7

x=0

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