A=-7(3a-1)

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Solution for A=-7(3a-1) equation: 



=-7(3A-1)

We move all terms to the left:

-(-7(3A-1))=0



We calculate terms in parentheses: -(-7(3A-1)), so:

-7(3A-1)

We multiply parentheses

-21A+7

Back to the equation:

-(-21A+7)



We get rid of parentheses

21A-7=0

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

21A=7

A=7/21

A=1/3

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