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5(5n-7)=165
We move all terms to the left:
5(5n-7)-(165)=0
We multiply parentheses
25n-35-165=0
We add all the numbers together, and all the variables
25n-200=0
We move all terms containing n to the left, all other terms to the right
25n=200
n=200/25
n=8
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