n-20+n-20+90=180

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Solution for n-20+n-20+90=180 equation: 



n-20+n-20+90=180

We move all terms to the left:

n-20+n-20+90-(180)=0

We add all the numbers together, and all the variables

2n-130=0

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

2n=130

n=130/2

n=65

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