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4n=1/2(2-2-12)
We move all terms to the left:
4n-(1/2(2-2-12))=0
We add all the numbers together, and all the variables
4n-(1/2(-12))=0
We multiply all the terms by the denominator
4n*2(-12))-(1=0
Wy multiply elements
8n^2(-=0
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