31=12+x-2

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Solution for 31=12+x-2 equation: 



31=12+x-2

We move all terms to the left:

31-(12+x-2)=0

We add all the numbers together, and all the variables

-(x+10)+31=0

We get rid of parentheses

-x-10+31=0

We add all the numbers together, and all the variables

-1x+21=0

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

-x=-21

x=-21/-1

x=+21

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