-1-x=20

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Solution for -1-x=20 equation: 



-1-x=20

We move all terms to the left:

-1-x-(20)=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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