A=(3x-12)

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Solution for A=(3x-12) equation: 



=(3A-12)

We move all terms to the left:

-((3A-12))=0



We calculate terms in parentheses: -((3A-12)), so:

(3A-12)

We get rid of parentheses

3A-12

Back to the equation:

-(3A-12)



We get rid of parentheses

-3A+12=0

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

-3A=-12

A=-12/-3

A=+4

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