-21=-1-x

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Solution for -21=-1-x equation: 



-21=-1-x

We move all terms to the left:

-21-(-1-x)=0

We add all the numbers together, and all the variables

-(-1x-1)-21=0

We get rid of parentheses

1x+1-21=0

We add all the numbers together, and all the variables

x-20=0

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

x=20

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