21=3(x+7)

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



21=3(x+7)

We move all terms to the left:

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

-3x-21+21=0

We add all the numbers together, and all the variables

-3x=0

x=0/-3

x=0

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