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(7+-5n)4-12n=108
We move all terms to the left:
(7+-5n)4-12n-(108)=0
We add all the numbers together, and all the variables
(-5n)4-12n-108=0
We add all the numbers together, and all the variables
-12n+(-5n)4-108=0
We multiply parentheses
-12n-20n-108=0
We add all the numbers together, and all the variables
-32n-108=0
We move all terms containing n to the left, all other terms to the right
-32n=108
n=108/-32
n=-3+3/8
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