31=20+x

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Solution for 31=20+x equation: 



31=20+x

We move all terms to the left:

31-(20+x)=0

We add all the numbers together, and all the variables

-(x+20)+31=0

We get rid of parentheses

-x-20+31=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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