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X^2-((3*x^9)/4) = 6 // - 6
X^2-((3*x^9)/4)-6 = 0
X^2+(-3/4)*x^9-6 = 0
-3/4*x^9 = -(X^2-6) // : -3/4
x^9 = -4/3*(6-X^2)
x^9 = -4/3*(6-X^2) // ^ 1/9
x = -(4/3)^(1/9)*(6-X^2)^(1/9)
x = -(4/3)^(1/9)*(6-X^2)^(1/9)
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