(n+20)-(3n-10)=180

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Solution for (n+20)-(3n-10)=180 equation: 



(n+20)-(3n-10)=180

We move all terms to the left:

(n+20)-(3n-10)-(180)=0

We get rid of parentheses

n-3n+20+10-180=0

We add all the numbers together, and all the variables

-2n-150=0

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

-2n=150

n=150/-2

n=-75

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