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6(n-1)=-78
We move all terms to the left:
6(n-1)-(-78)=0
We add all the numbers together, and all the variables
6(n-1)+78=0
We multiply parentheses
6n-6+78=0
We add all the numbers together, and all the variables
6n+72=0
We move all terms containing n to the left, all other terms to the right
6n=-72
n=-72/6
n=-12
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