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