O=400+20x

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Solution for O=400+20x equation: 



=400+20O

We move all terms to the left:

-(400+20O)=0

We add all the numbers together, and all the variables

-(20O+400)=0

We get rid of parentheses

-20O-400=0

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

-20O=400

O=400/-20

O=-20

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