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5(5n-4)=105
We move all terms to the left:
5(5n-4)-(105)=0
We multiply parentheses
25n-20-105=0
We add all the numbers together, and all the variables
25n-125=0
We move all terms containing n to the left, all other terms to the right
25n=125
n=125/25
n=5
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