-x+20=21

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Solution for -x+20=21 equation: 



-x+20=21

We move all terms to the left:

-x+20-(21)=0

We add all the numbers together, and all the variables

-1x-1=0

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

-x=1

x=1/-1

x=-1

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