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207=57-x
We move all terms to the left:
207-(57-x)=0
We add all the numbers together, and all the variables
-(-1x+57)+207=0
We get rid of parentheses
1x-57+207=0
We add all the numbers together, and all the variables
x+150=0
We move all terms containing x to the left, all other terms to the right
x=-150
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