31n-21+17n+9=180

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Solution for 31n-21+17n+9=180 equation: 



31n-21+17n+9=180

We move all terms to the left:

31n-21+17n+9-(180)=0

We add all the numbers together, and all the variables

48n-192=0

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

48n=192

n=192/48

n=4

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