A=(3x+6)2

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Solution for A=(3x+6)2 equation: 



=(3A+6)2

We move all terms to the left:

-((3A+6)2)=0



We calculate terms in parentheses: -((3A+6)2), so:

(3A+6)2

We multiply parentheses

6A+12

Back to the equation:

-(6A+12)



We get rid of parentheses

-6A-12=0

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

-6A=12

A=12/-6

A=-2

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