100=20n+40

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Solution for 100=20n+40 equation: 



100=20n+40

We move all terms to the left:

100-(20n+40)=0

We get rid of parentheses

-20n-40+100=0

We add all the numbers together, and all the variables

-20n+60=0

We move all terms containing n to the left, all other terms to the right

-20n=-60

n=-60/-20

n=+3

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