6x-21=3(2x+7)

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Solution for 6x-21=3(2x+7) equation: 



6x-21=3(2x+7)

We move all terms to the left:

6x-21-(3(2x+7))=0



We calculate terms in parentheses: -(3(2x+7)), so:

3(2x+7)

We multiply parentheses

6x+21

Back to the equation:

-(6x+21)



We get rid of parentheses

6x-6x-21-21=0

We add all the numbers together, and all the variables

-42!=0

There is no solution for this equation

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