A=-(3x-7)

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



=-(3A-7)

We move all terms to the left:

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



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

-(3A-7)

We get rid of parentheses

-3A+7

Back to the equation:

-(-3A+7)



We get rid of parentheses

3A-7=0

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

3A=7

A=7/3

A=2+1/3

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