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100x-1=20x+3
We move all terms to the left:
100x-1-(20x+3)=0
We get rid of parentheses
100x-20x-3-1=0
We add all the numbers together, and all the variables
80x-4=0
We move all terms containing x to the left, all other terms to the right
80x=4
x=4/80
x=1/20
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