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x in (-oo:+oo)
(3*x^80)/10+6*x^2 = 0
3/10*x^80+6*x^2 = 0
t_1 = x^2
3/10*t_1^40+6*t_1^1 = 0
3/10*t_1^40+6*t_1 = 0
3*t_1*(1/10*t_1^39+2) = 0
1/10*t_1^39 = -2 // : 1/10
t_1^39 = -20
t_1^39 = -20 // ^ 1/39
t_1 = -20^(1/39)
3*t_1 = 0
3*t_1 = 0 // : 3
t_1 = 0
t_1 = -20^(1/39)
x^2+20^(1/39) = 0
1*x^2 = -20^(1/39) // : 1
x^2 = -20^(1/39)
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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