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k in (-oo:+oo)
(3/4)*k^2*(8*k-(12*k^2)) = 0
(3/4)*k^2*(8*k-12*k^2) = 0
3/4*k^2*(8*k-12*k^2) = 0
8*k-12*k^2 = 0
4*k*(2-3*k) = 0
2-3*k = 0 // - 2
-3*k = -2 // : -3
k = -2/(-3)
k = 2/3
4*k*(k-2/3) = 0
3/4*4*k*k^2*(k-2/3) = 0
( 3/4*k^2 )
3/4*k^2 = 0 // : 3/4
k^2 = 0
k = 0
( 4*k )
4*k = 0 // : 4
k = 0
( k-2/3 )
k-2/3 = 0 // + 2/3
k = 2/3
k in { 0, 0, 2/3 }
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