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x in (-oo:+oo)
((6*x)/10)*x^3+2*x^2 = 0
3/5*x^4+2*x^2 = 0
t_1 = x^2
3/5*t_1^2+2*t_1^1 = 0
3/5*t_1^2+2*t_1 = 0
DELTA = 2^2-(0*3/5*4)
DELTA = 4
DELTA > 0
t_1 = (4^(1/2)-2)/(3/5*2) or t_1 = (-4^(1/2)-2)/(3/5*2)
t_1 = 0 or t_1 = -10/3
t_1 = -10/3
x^2+10/3 = 0
1*x^2 = -10/3 // : 1
x^2 = -10/3
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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