A+2A+2A=b

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Solution for A+2A+2A=b equation: 



+2+2=A

We move all terms to the left:

+2+2-(A)=0

We add all the numbers together, and all the variables

-1A+4=0

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

-A=-4

A=-4/-1

A=+4

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