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20x-100=-80x+200
We move all terms to the left:
20x-100-(-80x+200)=0
We get rid of parentheses
20x+80x-200-100=0
We add all the numbers together, and all the variables
100x-300=0
We move all terms containing x to the left, all other terms to the right
100x=300
x=300/100
x=3
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