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n in (-oo:+oo)
6*n = ((2*n)/3)*(5*n-2) // - ((2*n)/3)*(5*n-2)
6*n-(((2*n)/3)*(5*n-2)) = 0
(-2/3)*n*(5*n-2)+6*n = 0
6*n-2/3*n*(5*n-2) = 0
6*n-2/3*n*(5*n-2) = 0
22/3*n-10/3*n^2 = 0
22/3*n-10/3*n^2 = 0
2/3*n*(11-5*n) = 0
11-5*n = 0 // - 11
-5*n = -11 // : -5
n = -11/(-5)
n = 11/5
2/3*n*(n-11/5) = 0
2/3*n*(n-11/5) = 0
( 2/3*n )
2/3*n = 0 // : 2/3
n = 0
( n-11/5 )
n-11/5 = 0 // + 11/5
n = 11/5
n in { 0, 11/5 }
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