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x in (-oo:+oo)
X/5 = 3*x^9 // - 3*x^9
X/5-(3*x^9) = 0
X/5-3*x^9 = 0
-3*x^9 = -(1/5*X) // : -3
x^9 = 1/15*X
x^9 = 1/15*X // ^ 1/9
x = (1/15)^(1/9)*X^(1/9)
x = (1/15)^(1/9)*X^(1/9)
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