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3(-4n+1)=75
We move all terms to the left:
3(-4n+1)-(75)=0
We multiply parentheses
-12n+3-75=0
We add all the numbers together, and all the variables
-12n-72=0
We move all terms containing n to the left, all other terms to the right
-12n=72
n=72/-12
n=-6
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