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-n/4=20
We move all terms to the left:
-n/4-(20)=0
We multiply all the terms by the denominator
-n-20*4=0
We add all the numbers together, and all the variables
-1n-80=0
We move all terms containing n to the left, all other terms to the right
-n=80
n=80/-1
n=-80
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