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k in (-oo:+oo)
(((5/12)*k)/5)*k+k-((3/4)*k) = 0
(((5/12)*k)/5)*k+k+(-3/4)*k = 0
1/12*k^2+1/4*k = 0
DELTA = (1/4)^2-(0*1/12*4)
DELTA = 1/16
DELTA > 0
k = ((1/16)^(1/2)-1/4)/(1/12*2) or k = (-(1/16)^(1/2)-1/4)/(1/12*2)
k = 0 or k = -3
k in { -3, 0 }
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