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0.5*100=0.4n
We move all terms to the left:
0.5*100-(0.4n)=0
We add all the numbers together, and all the variables
-(+0.4n)+0.5*100=0
We add all the numbers together, and all the variables
-(+0.4n)+50=0
We get rid of parentheses
-0.4n+50=0
We move all terms containing n to the left, all other terms to the right
-0.4n=-50
n=-50/-0.4
n=+125
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