9=1x+20

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Solution for 9=1x+20 equation: 



9=1x+20

We move all terms to the left:

9-(1x+20)=0

We add all the numbers together, and all the variables

-(x+20)+9=0

We get rid of parentheses

-x-20+9=0

We add all the numbers together, and all the variables

-1x-11=0

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

-x=11

x=11/-1

x=-11

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