Your formatting is ambiguous; I think you mean the following:
. . . . .
If so, then a good first step in solving this rational equation is probably to multiply through, to get rid of the denominators:
. . . . .
. . . . .
. . . . .
. . . . .
Then collect all the terms on one side of the "equals" sign:
. . . . .
Then apply the Quadratic Formula to solve for "n". Remember to check your solutions in the original equation, making sure that they don't cause any "division by zero" problems.