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246=42-x
We move all terms to the left:
246-(42-x)=0
We add all the numbers together, and all the variables
-(-1x+42)+246=0
We get rid of parentheses
1x-42+246=0
We add all the numbers together, and all the variables
x+204=0
We move all terms containing x to the left, all other terms to the right
x=-204
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