12=20+x

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Solution for 12=20+x equation: 



12=20+x

We move all terms to the left:

12-(20+x)=0

We add all the numbers together, and all the variables

-(x+20)+12=0

We get rid of parentheses

-x-20+12=0

We add all the numbers together, and all the variables

-1x-8=0

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

-x=8

x=8/-1

x=-8

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