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n in (-oo:+oo)
13-(((4*n)/3)*n) = 2 // - 2
13-(((4*n)/3)*n)-2 = 0
(-4/3)*n^2-2+13 = 0
-4/3*n^2 = -11 // : -4/3
n^2 = 33/4
n^2 = 33/4 // ^ 1/2
abs(n) = (33/4)^(1/2)
n = (33/4)^(1/2) or n = -(33/4)^(1/2)
n in { (33/4)^(1/2), -(33/4)^(1/2) }
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