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-5(8n-5)=105
We move all terms to the left:
-5(8n-5)-(105)=0
We multiply parentheses
-40n+25-105=0
We add all the numbers together, and all the variables
-40n-80=0
We move all terms containing n to the left, all other terms to the right
-40n=80
n=80/-40
n=-2
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