A=12x+42

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Solution for A=12x+42 equation: 



=12A+42

We move all terms to the left:

-(12A+42)=0

We get rid of parentheses

-12A-42=0

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

-12A=42

A=42/-12

A=-3+1/2

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