A=12+4x

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Solution for A=12+4x equation: 



=12+4A

We move all terms to the left:

-(12+4A)=0

We add all the numbers together, and all the variables

-(4A+12)=0

We get rid of parentheses

-4A-12=0

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

-4A=12

A=12/-4

A=-3

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