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237=139-x
We move all terms to the left:
237-(139-x)=0
We add all the numbers together, and all the variables
-(-1x+139)+237=0
We get rid of parentheses
1x-139+237=0
We add all the numbers together, and all the variables
x+98=0
We move all terms containing x to the left, all other terms to the right
x=-98
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