9=20+w

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Solution for 9=20+w equation: 



9=20+w

We move all terms to the left:

9-(20+w)=0

We add all the numbers together, and all the variables

-(w+20)+9=0

We get rid of parentheses

-w-20+9=0

We add all the numbers together, and all the variables

-1w-11=0

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

-w=11

w=11/-1

w=-11

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