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104=18+x
We move all terms to the left:
104-(18+x)=0
We add all the numbers together, and all the variables
-(x+18)+104=0
We get rid of parentheses
-x-18+104=0
We add all the numbers together, and all the variables
-1x+86=0
We move all terms containing x to the left, all other terms to the right
-x=-86
x=-86/-1
x=+86
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