9=6x+7(-x+3)

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Solution for 9=6x+7(-x+3) equation: 



9=6x+7(-x+3)

We move all terms to the left:

9-(6x+7(-x+3))=0

We add all the numbers together, and all the variables

-(6x+7(-1x+3))+9=0



We calculate terms in parentheses: -(6x+7(-1x+3)), so:

6x+7(-1x+3)

We multiply parentheses

6x-7x+21

We add all the numbers together, and all the variables

-1x+21

Back to the equation:

-(-1x+21)



We get rid of parentheses

1x-21+9=0

We add all the numbers together, and all the variables

x-12=0

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

x=12

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