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x/100=0.8
We move all terms to the left:
x/100-(0.8)=0
We add all the numbers together, and all the variables
x/100-0.8=0
We multiply all the terms by the denominator
x-(0.8)*100=0
We add all the numbers together, and all the variables
x-80=0
We move all terms containing x to the left, all other terms to the right
x=80
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