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(5/6)*x^4-((1/2)*x^2)+6 = 0
(5/6)*x^4+(-1/2)*x^2+6 = 0
5/6*x^4-1/2*x^2+6 = 0
t_1 = x^2
5/6*t_1^2-1/2*t_1^1+6 = 0
5/6*t_1^2-1/2*t_1+6 = 0
DELTA = (-1/2)^2-(5/6*4*6)
DELTA = -79/4
DELTA < 0
x belongs to the empty set
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