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-21/2=4N
We move all terms to the left:
-21/2-(4N)=0
We multiply all the terms by the denominator
-4N*2-21=0
Wy multiply elements
-8N-21=0
We move all terms containing N to the left, all other terms to the right
-8N=21
N=21/-8
N=-2+5/8
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