n+(2n+20)+(4n-20)=180

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Solution for n+(2n+20)+(4n-20)=180 equation: 



n+(2n+20)+(4n-20)=180

We move all terms to the left:

n+(2n+20)+(4n-20)-(180)=0

We get rid of parentheses

n+2n+4n+20-20-180=0

We add all the numbers together, and all the variables

7n-180=0

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

7n=180

n=180/7

n=25+5/7

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