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31=-x+204
We move all terms to the left:
31-(-x+204)=0
We add all the numbers together, and all the variables
-(-1x+204)+31=0
We get rid of parentheses
1x-204+31=0
We add all the numbers together, and all the variables
x-173=0
We move all terms containing x to the left, all other terms to the right
x=173
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