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23=31-x
We move all terms to the left:
23-(31-x)=0
We add all the numbers together, and all the variables
-(-1x+31)+23=0
We get rid of parentheses
1x-31+23=0
We add all the numbers together, and all the variables
x-8=0
We move all terms containing x to the left, all other terms to the right
x=8
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