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100x-1000=200x+2000
We move all terms to the left:
100x-1000-(200x+2000)=0
We get rid of parentheses
100x-200x-2000-1000=0
We add all the numbers together, and all the variables
-100x-3000=0
We move all terms containing x to the left, all other terms to the right
-100x=3000
x=3000/-100
x=-30
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