100=n-20

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Solution for 100=n-20 equation: 



100=n-20

We move all terms to the left:

100-(n-20)=0

We get rid of parentheses

-n+20+100=0

We add all the numbers together, and all the variables

-1n+120=0

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

-n=-120

n=-120/-1

n=+120

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