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100x+12000=200x+4000
We move all terms to the left:
100x+12000-(200x+4000)=0
We get rid of parentheses
100x-200x-4000+12000=0
We add all the numbers together, and all the variables
-100x+8000=0
We move all terms containing x to the left, all other terms to the right
-100x=-8000
x=-8000/-100
x=+80
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