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19=5n.n=
We move all terms to the left:
19-(5n.n)=0
We add all the numbers together, and all the variables
-(+5n.n)+19=0
We get rid of parentheses
-5n.n+19=0
We move all terms containing n to the left, all other terms to the right
-5n.n=-19
n=-19/1
n=-19
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