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k in (-oo:+oo)
(0.2*2*k^2)/3 = 0.1*k // - 0.1*k
(0.2*2*k^2)/3-(0.1*k) = 0
(0.2*2*k^2)/3-0.1*k = 0
0.13333333*k^2-0.1*k = 0
DELTA = (-0.1)^2-(0*0.13333333*4)
DELTA = 0.1^2
DELTA = 0.01
DELTA > 0
k = ((0.1^2)^(1/2)+0.1)/(0.13333333*2) or k = (0.1-(0.1^2)^(1/2))/(0.13333333*2)
k = 0.75000002 or k = 0
k in { 0, 0.75000002 }
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