7x+9=3*(3x+7)

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



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

We move all terms to the left:

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



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

3(3x+7)

We multiply parentheses

9x+21

Back to the equation:

-(9x+21)



We get rid of parentheses

7x-9x-21+9=0

We add all the numbers together, and all the variables

-2x-12=0

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

-2x=12

x=12/-2

x=-6

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