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-1=20-x
We move all terms to the left:
-1-(20-x)=0
We add all the numbers together, and all the variables
-(-1x+20)-1=0
We get rid of parentheses
1x-20-1=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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