-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-21)=0

We add all the numbers together, and all the variables

-1x-(x-21)=0

We get rid of parentheses

-1x-x+21=0

We add all the numbers together, and all the variables

-2x+21=0

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

-2x=-21

x=-21/-2

x=10+1/2

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