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(8n-20)+(2n+10)=180
We move all terms to the left:
(8n-20)+(2n+10)-(180)=0
We get rid of parentheses
8n+2n-20+10-180=0
We add all the numbers together, and all the variables
10n-190=0
We move all terms containing n to the left, all other terms to the right
10n=190
n=190/10
n=19
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