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(100-x)/100=0.4
We move all terms to the left:
(100-x)/100-(0.4)=0
We add all the numbers together, and all the variables
(-1x+100)/100-(0.4)=0
We add all the numbers together, and all the variables
(-1x+100)/100-0.4=0
We multiply all the terms by the denominator
(-1x+100)-(0.4)*100=0
We add all the numbers together, and all the variables
(-1x+100)-40=0
We get rid of parentheses
-1x+100-40=0
We add all the numbers together, and all the variables
-1x+60=0
We move all terms containing x to the left, all other terms to the right
-x=-60
x=-60/-1
x=+60
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