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101=-x+20
We move all terms to the left:
101-(-x+20)=0
We add all the numbers together, and all the variables
-(-1x+20)+101=0
We get rid of parentheses
1x-20+101=0
We add all the numbers together, and all the variables
x+81=0
We move all terms containing x to the left, all other terms to the right
x=-81
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