800=20+x

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Solution for 800=20+x equation: 



800=20+x

We move all terms to the left:

800-(20+x)=0

We add all the numbers together, and all the variables

-(x+20)+800=0

We get rid of parentheses

-x-20+800=0

We add all the numbers together, and all the variables

-1x+780=0

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

-x=-780

x=-780/-1

x=+780

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