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x in (-oo:+oo)
x*((6*x^3)/4)-3 = 0
3/2*x^4 = 3 // : 3/2
x^4 = 2
x^4 = 2 // ^ 1/4
abs(x) = 2^(1/4)
x = 2^(1/4) or x = -2^(1/4)
x in { 2^(1/4), -2^(1/4) }
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