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100x+100=50x+200
We move all terms to the left:
100x+100-(50x+200)=0
We get rid of parentheses
100x-50x-200+100=0
We add all the numbers together, and all the variables
50x-100=0
We move all terms containing x to the left, all other terms to the right
50x=100
x=100/50
x=2
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