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x in (-oo:+oo)
(36*x)/9-(x^2*((x^7)/4)) = 0
(-1/4)*x^9+(36*x)/9 = 0
4*x-1/4*x^9 = 0
x*(4-1/4*x^8) = 0
-1/4*x^8 = -4 // : -1/4
x^8 = 16
x^8 = 16 // ^ 1/8
abs(x) = 16^(1/8)
x = 16^(1/8) or x = -16^(1/8)
x = 0
x = 0
x in { 16^(1/8), -16^(1/8), 0 }
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