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4(3n-7)=55
We move all terms to the left:
4(3n-7)-(55)=0
We multiply parentheses
12n-28-55=0
We add all the numbers together, and all the variables
12n-83=0
We move all terms containing n to the left, all other terms to the right
12n=83
n=83/12
n=6+11/12
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