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2x=100+x
We move all terms to the left:
2x-(100+x)=0
We add all the numbers together, and all the variables
2x-(x+100)=0
We get rid of parentheses
2x-x-100=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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