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x in (-oo:+oo)
x^10*((-20*x^16-(6*x^13))/(-2)) = 0
x^10*((-20*x^16-6*x^13)/(-2)) = 0
(x^10*(-20*x^16-6*x^13))/(-2) = 0
-20*x^16-6*x^13 = 0
-2*x^13*(10*x^3+3) = 0
10*x^3 = -3 // : 10
x^3 = -3/10
x^3 = -3/10 // ^ 1/3
x = -(3/10)^(1/3)
-2*x^13*(x+(3/10)^(1/3)) = 0
(-2*x^10*x^13*(x+(3/10)^(1/3)))/(-2) = 0
( -2*x^13 )
-2*x^13 = 0 // : -2
x^13 = 0
x = 0
( x+(3/10)^(1/3) )
x+(3/10)^(1/3) = 0 // - (3/10)^(1/3)
x = -(3/10)^(1/3)
( x^10 )
1*x^10 = 0 // : 1
x^10 = 0
x = 0
x in { 0, -(3/10)^(1/3), 0 }
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