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n+30+n+134+n+16+126+n+161+n-12=1080
We move all terms to the left:
n+30+n+134+n+16+126+n+161+n-12-(1080)=0
We add all the numbers together, and all the variables
5n-625=0
We move all terms containing n to the left, all other terms to the right
5n=625
n=625/5
n=125
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