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2x+100=4x+200
We move all terms to the left:
2x+100-(4x+200)=0
We get rid of parentheses
2x-4x-200+100=0
We add all the numbers together, and all the variables
-2x-100=0
We move all terms containing x to the left, all other terms to the right
-2x=100
x=100/-2
x=-50
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