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7(4n-1)=49
We move all terms to the left:
7(4n-1)-(49)=0
We multiply parentheses
28n-7-49=0
We add all the numbers together, and all the variables
28n-56=0
We move all terms containing n to the left, all other terms to the right
28n=56
n=56/28
n=2
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