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x in (-oo:+oo)
27 = (x^3)/2 // - (x^3)/2
27-((x^3)/2) = 0
-1/2*x^3 = -27 // : -1/2
x^3 = 54
x^3 = 54 // ^ 1/3
x = 3*2^(1/3)
x = 3*2^(1/3)
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