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x^2*((20*x^5-(24*x^4))/4) = 0
x^2*((20*x^5-24*x^4)/4) = 0
(x^2*(20*x^5-24*x^4))/4 = 0
20*x^5-24*x^4 = 0
4*x^4*(5*x-6) = 0
5*x-6 = 0 // + 6
5*x = 6 // : 5
x = 6/5
4*x^4*(x-6/5) = 0
(4*x^2*x^4*(x-6/5))/4 = 0
( 4*x^4 )
4*x^4 = 0 // : 4
x^4 = 0
x = 0
( x-6/5 )
x-6/5 = 0 // + 6/5
x = 6/5
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0, 6/5, 0 }
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