O=21+2w

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Solution for O=21+2w equation: 



=21+2O

We move all terms to the left:

-(21+2O)=0

We add all the numbers together, and all the variables

-(2O+21)=0

We get rid of parentheses

-2O-21=0

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

-2O=21

O=21/-2

O=-10+1/2

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