A=42+b

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Solution for A=42+b equation: 



=42+A

We move all terms to the left:

-(42+A)=0

We add all the numbers together, and all the variables

-(A+42)=0

We get rid of parentheses

-A-42=0

We add all the numbers together, and all the variables

-1A-42=0

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

-A=42

A=42/-1

A=-42

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