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90(n+10)+n=180
We move all terms to the left:
90(n+10)+n-(180)=0
We add all the numbers together, and all the variables
n+90(n+10)-180=0
We multiply parentheses
n+90n+900-180=0
We add all the numbers together, and all the variables
91n+720=0
We move all terms containing n to the left, all other terms to the right
91n=-720
n=-720/91
n=-7+83/91
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