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5(-1+n)=80
We move all terms to the left:
5(-1+n)-(80)=0
We add all the numbers together, and all the variables
5(n-1)-80=0
We multiply parentheses
5n-5-80=0
We add all the numbers together, and all the variables
5n-85=0
We move all terms containing n to the left, all other terms to the right
5n=85
n=85/5
n=17
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