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x in (-oo:+oo)
x*((14*x^4+20*x)/4) = 0
(x*(14*x^4+20*x))/4 = 0
14*x^4+20*x = 0
2*x*(7*x^3+10) = 0
7*x^3 = -10 // : 7
x^3 = -10/7
x^3 = -10/7 // ^ 1/3
x = -(10/7)^(1/3)
2*x*(x+(10/7)^(1/3)) = 0
(2*x*x*(x+(10/7)^(1/3)))/4 = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x+(10/7)^(1/3) )
x+(10/7)^(1/3) = 0 // - (10/7)^(1/3)
x = -(10/7)^(1/3)
( x )
x = 0
x in { 0, -(10/7)^(1/3), 0 }
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