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6.5n.n=1.8
We move all terms to the left:
6.5n.n-(1.8)=0
We add all the numbers together, and all the variables
6.5n.n-1.8=0
We move all terms containing n to the left, all other terms to the right
6.5n.n=1.8
n=1.8/1
n=1.8
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