A=-4+2b

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Solution for A=-4+2b equation: 



=-4+2A

We move all terms to the left:

-(-4+2A)=0

We add all the numbers together, and all the variables

-(2A-4)=0

We get rid of parentheses

-2A+4=0

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

-2A=-4

A=-4/-2

A=+2

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