9x-21=3(x-7)=6x

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Solution for 9x-21=3(x-7)=6x equation: 



9x-21=3(x-7)=6x

We move all terms to the left:

9x-21-(3(x-7))=0



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

3(x-7)

We multiply parentheses

3x-21

Back to the equation:

-(3x-21)



We get rid of parentheses

9x-3x+21-21=0

We add all the numbers together, and all the variables

6x=0

x=0/6

x=0

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