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10n-5(n-2)=25
We move all terms to the left:
10n-5(n-2)-(25)=0
We multiply parentheses
10n-5n+10-25=0
We add all the numbers together, and all the variables
5n-15=0
We move all terms containing n to the left, all other terms to the right
5n=15
n=15/5
n=3
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