11=20-x

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Solution for 11=20-x equation: 



11=20-x

We move all terms to the left:

11-(20-x)=0

We add all the numbers together, and all the variables

-(-1x+20)+11=0

We get rid of parentheses

1x-20+11=0

We add all the numbers together, and all the variables

x-9=0

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

x=9

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