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n in (-oo:+oo)
3*(2*n+1)-(n*((4*(2*n-1))/2))-(2*n)+1 = 0
3*(2*n+1)-2*n*(2*n-1)-2*n+1 = 0
3*(2*n+1)-2*n*(2*n-1)-2*n+1 = 0
8*n-4*n^2-2*n+1+3 = 0
6*n-4*n^2+1+3 = 0
6*n-4*n^2+4 = 0
6*n-4*n^2+4 = 0
2*(3*n-2*n^2+2) = 0
3*n-2*n^2+2 = 0
DELTA = 3^2-(-2*2*4)
DELTA = 25
DELTA > 0
n = (25^(1/2)-3)/(-2*2) or n = (-25^(1/2)-3)/(-2*2)
n = -1/2 or n = 2
2*(n+1/2)*(n-2) = 0
2*(n+1/2)*(n-2) = 0
( n+1/2 )
n+1/2 = 0 // - 1/2
n = -1/2
( n-2 )
n-2 = 0 // + 2
n = 2
n in { -1/2, 2 }
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