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100x=80x+20000
We move all terms to the left:
100x-(80x+20000)=0
We get rid of parentheses
100x-80x-20000=0
We add all the numbers together, and all the variables
20x-20000=0
We move all terms containing x to the left, all other terms to the right
20x=20000
x=20000/20
x=1000
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