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20.31=x-8.43
We move all terms to the left:
20.31-(x-8.43)=0
We get rid of parentheses
-x+8.43+20.31=0
We add all the numbers together, and all the variables
-1x+28.74=0
We move all terms containing x to the left, all other terms to the right
-x=-28.74
x=-28.74/-1
x=28+0.74/1
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