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5*x^6+(6*x^2)/3 = 0
5*x^6+2*x^2 = 0
t_1 = x^2
5*t_1^3+2*t_1^1 = 0
5*t_1^3+2*t_1 = 0
t_1*(5*t_1^2+2) = 0
5*t_1^2 = -2 // : 5
t_1^2 = -2/5
t_1 = 0
t_1 = 0
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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