57=20-x

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Solution for 57=20-x equation: 



57=20-x

We move all terms to the left:

57-(20-x)=0

We add all the numbers together, and all the variables

-(-1x+20)+57=0

We get rid of parentheses

1x-20+57=0

We add all the numbers together, and all the variables

x+37=0

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

x=-37

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