A=7(x+3)

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



=7(A+3)

We move all terms to the left:

-(7(A+3))=0



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

7(A+3)

We multiply parentheses

7A+21

Back to the equation:

-(7A+21)



We get rid of parentheses

-7A-21=0

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

-7A=21

A=21/-7

A=-3

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