100-4n=80

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Solution for 100-4n=80 equation: 



100-4n=80

We move all terms to the left:

100-4n-(80)=0

We add all the numbers together, and all the variables

-4n+20=0

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

-4n=-20

n=-20/-4

n=+5

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