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100=2n+40
We move all terms to the left:
100-(2n+40)=0
We get rid of parentheses
-2n-40+100=0
We add all the numbers together, and all the variables
-2n+60=0
We move all terms containing n to the left, all other terms to the right
-2n=-60
n=-60/-2
n=+30
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