-x-1=x=21

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Solution for -x-1=x=21 equation: 



-x-1=x=21

We move all terms to the left:

-x-1-(x)=0

We add all the numbers together, and all the variables

-2x-1=0

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

-2x=1

x=1/-2

x=-1/2

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