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x in (-oo:+oo)
4*4*4*x*x*x+10*10*x*x+((9*x)/2)*x = 0
64*x^3+209/2*x^2 = 0
x^2*(64*x+209/2) = 0
64*x+209/2 = 0 // - 209/2
64*x = -209/2 // : 64
x = -209/2/64
x = -209/128
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { -209/128, 0 }
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