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7(n-1)=6n
We move all terms to the left:
7(n-1)-(6n)=0
We add all the numbers together, and all the variables
-6n+7(n-1)=0
We multiply parentheses
-6n+7n-7=0
We add all the numbers together, and all the variables
n-7=0
We move all terms containing n to the left, all other terms to the right
n=7
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