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9=6x+2+7x

We move all terms to the left:

9-(6x+2+7x)=0

We add all the numbers together, and all the variables

-(13x+2)+9=0

We get rid of parentheses

-13x-2+9=0

We add all the numbers together, and all the variables

-13x+7=0

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

-13x=-7

x=-7/-13

x=7/13

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