A=3(x+7)=

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



=3(A+7)=

We move all terms to the left:

-(3(A+7))=0



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

3(A+7)

We multiply parentheses

3A+21

Back to the equation:

-(3A+21)



We get rid of parentheses

-3A-21=0

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

-3A=21

A=21/-3

A=-7

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