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4(4n+5)=30
We move all terms to the left:
4(4n+5)-(30)=0
We multiply parentheses
16n+20-30=0
We add all the numbers together, and all the variables
16n-10=0
We move all terms containing n to the left, all other terms to the right
16n=10
n=10/16
n=5/8
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