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k in (-oo:+oo)
k*((k^2+48*k-12)/6) = 0
(k*(k^2+48*k-12))/6 = 0
k^2+48*k-12 = 0
k^2+48*k-12 = 0
DELTA = 48^2-(-12*1*4)
DELTA = 2352
DELTA > 0
k = (2352^(1/2)-48)/(1*2) or k = (-2352^(1/2)-48)/(1*2)
k = (28*3^(1/2)-48)/2 or k = (-28*3^(1/2)-48)/2
(k-((-28*3^(1/2)-48)/2))*(k-((28*3^(1/2)-48)/2)) = 0
(k*(k-((-28*3^(1/2)-48)/2))*(k-((28*3^(1/2)-48)/2)))/6 = 0
( k-((-28*3^(1/2)-48)/2) )
k-((-28*3^(1/2)-48)/2) = 0 // + (-28*3^(1/2)-48)/2
k = (-28*3^(1/2)-48)/2
( k-((28*3^(1/2)-48)/2) )
k-((28*3^(1/2)-48)/2) = 0 // + (28*3^(1/2)-48)/2
k = (28*3^(1/2)-48)/2
( k )
k = 0
k in { (-28*3^(1/2)-48)/2, (28*3^(1/2)-48)/2, 0 }
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