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x in (-oo:+oo)
0 = (x/9)*x^2-4 // - (x/9)*x^2-4
0-((x/9)*x^2)+4 = 0
(-1/9)*x^3+0+4 = 0
-1/9*x^3 = -4 // : -1/9
x^3 = 36
x^3 = 36 // ^ 1/3
x = 36^(1/3)
x = 36^(1/3)
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