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207=102-x
We move all terms to the left:
207-(102-x)=0
We add all the numbers together, and all the variables
-(-1x+102)+207=0
We get rid of parentheses
1x-102+207=0
We add all the numbers together, and all the variables
x+105=0
We move all terms containing x to the left, all other terms to the right
x=-105
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