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x in (-oo:+oo)
8*x-(x*((36*x^3)/4)) = 0
8*x-9*x^4 = 0
8*x-9*x^4 = 0
x*(8-9*x^3) = 0
-9*x^3 = -8 // : -9
x^3 = 8/9
x^3 = 8/9 // ^ 1/3
x = (8/9)^(1/3)
x = 0
x = 0
x in { (8/9)^(1/3), 0 }
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