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200=100-x
We move all terms to the left:
200-(100-x)=0
We add all the numbers together, and all the variables
-(-1x+100)+200=0
We get rid of parentheses
1x-100+200=0
We add all the numbers together, and all the variables
x+100=0
We move all terms containing x to the left, all other terms to the right
x=-100
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