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21/2=5nn=
We move all terms to the left:
21/2-(5nn)=0
We multiply all the terms by the denominator
-5nn*2+21=0
Wy multiply elements
-10n+21=0
We move all terms containing n to the left, all other terms to the right
-10n=-21
n=-21/-10
n=2+1/10
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